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\begin{itemize}
\section*{Books}

\subsection*{Translated}

\item[1] ``Tradução do livro "O Que é uma Lei Física", autor R. Feynman'', C. Fiolhais, Gradiva, Lisbon

with a introductory note by the translator (original: The Character of the Physical Law, MIT Press, Boston, 1967) (1989).

\item[2] ``Tradução do livro "O Jogo. As Leis Naturais que Regulam o Acaso", autores M. Eigen and R. Winkler'', C. Fiolhais, Gradiva, Lisbon

with a preface by the translator  (original: Das Spiel. Naturgesetze Steuern den Zufall, Piper, Muenchen, 1975) (1989).

\section*{Papers}

\subsection*{International Journals}

\item[3] ``Equation of collective submanifold for mixed states'', M. Yamamura, J. da Providência, A. Kuriyama and C. Fiolhais, Progress of Theoretical Physics {\bf 81}, 1198-1216 (1989).

\item[4] ``Landau damping in infinite nuclear matter.'', D.\,M. BRINK and J. DA PROVIDÊNCIA, Nucl. Phys. {\bf A500}, 301-307 (1989).

\item[5] ``Stability of relativistic Hartree states.'', T. KOHMURA, Y. MIYAMA, T. NAGAI, S. ONAKA, J. DA PROVIDÊNCIA and T. KODAMA, Phys. Lett. {\bf B226}, 207-212 (1989).

\item[6] ``Relativistic Vlasov approach to normal modes of nuclear matter.'', M. NIELSEN and J. DA PROVIDÊNCIA, Phys. Rev. {\bf C40}, 2377 (1989).

\item[7] ``On the C-determinantal range'', N. BEBIANO, M.\,E. MIRANDA, G.\,N. de OLIVEIRA and J. da PROVIDÊNCIA, Linear Algebra and its Applications {\bf 121}, 554-560 (1989).

\item[8] ``Multiparticle production in photon-photon collisions'', A.\,H. Blin, B. Hiller, T.\,C. Meng, Phys. Rev. {\bf D40}, 44 (1989).

\item[9] ``Metastable hot nuclei in a semiclassical description'', A.\,H. Blin, M. Brack, Nucl. Phys. {\bf A504}, 300 (1989).

\item[10] ``Mesonic Couplings in The Nambu-Jona-Lasinio Model: The sigma-pi-pi  decay'', M. C. Ruivo, Portugaliae Physica {\bf 20}, 55-63 (1989).

\item[11] ``Order Parameters and Properties of the sigma-pi sector in the Nambu-Jona-Lasinio Model'', C. A. de Sousa, Zeitschrift fur Physik C - Particles and Fields {\bf 43}, 503-508 (1989).

\item[12] ``Symmetric collision of two slabs in the framework of the Vlasov equation'', Pascoal, H. and Brito, L., Phys. Rev. C {\bf 39}, 158 (1989).

\item[13] ``Hedgehog structures in general quark-meson lagrangians'', E. Ruiz Arriola, P. Alberto, J.\,N. Urbano and K. Goeke, Zeitschrift fur Physik A - Hadrons and Nuclei {\bf 333}, 203-207 (1989).

\item[14] ``Collective and intrinsic degrees of freedom in the Heisenberg ferromagnet'', J. da Providência, C. Fiolhais and M. Brajczewska, Journal of Physics A: Mathematical and General {\bf 22}, 703-715 (1989).

\item[15] ``Charge density of FeF2'', M. M. R. Costa, M. J. M. de Almeida, and J. A. Paixão, Acta Crystallogr.B {\bf 45}, 549-555 (1989).

\item[16] ``Ordering of Nb-H beta-phase studied by PAC'', J. M. Gil, P. J. Mendes, A. Weidinger and N. Ayres de Campos, Zeit. Phys. Chem. Neue Folge {\bf 163}, 193-198 (1989).

\item[17] ``Effect of surface fluctuations in the line shape of plasma resonances in small metal clusters'', J.\,M. Pacheco and R.\,A. Broglia, Physical Review Letters {\bf 62}, 1400-1402 (1989).

\item[18] ``Algebraic manipulation of the states associated with the U(5)set of O(5) set of O(3) chain of groups:orthonormalization and matrix elements'', C. Yannouleas and J.\,M. Pacheco, Computer Physics Communications {\bf 54}, 315-328 (1989).

\item[19] ``Equation of the collective submanifold with mixed states'', 15.	M. Yamamura, J. da Providência, A. Kuriyama, and C. Fiolhais, Progress in Theoretical Physics {\bf 81}, 1198-1216 (1989).

\item[20] ``Magnetisation density in MnF2'', Costa, M. M. R., \& Brown, P. J., Physica B: Physics of Condensed Matter {\bf 156-157(C)}, 329-331 (1989).

\subsection*{Portuguese Journals}

\item[21] ``Um discurso sobre as ciências - algumas notas à margem'', M. C. Ruivo, Revista Crítica de Ciências Sociais {\bf 27/28}, 308-315 (1989).

\section*{Proceedings}

\subsection*{International Conferences}

\item[22] ``Sea quark effects and nucleon form factors'', K. Goeke, P. Alberto, M. Fiolhais, F. Gruemmer, Th.Meissner, E. Ruiz Arriola, J. N. Urbano, Proceedings of the International Conference on Excited Baryons 1988, G. Adams, N.\,C. Mukhopadhyay e P. Stoler (Eds.), World Scientific, Singapura, 110-115 (1989).

\item[23] ``PAC techniques applied to the study of structures. Nb-H beta-phase and its evolution with temperature'', J. M. Gil, P. J. Mendes, N. Ayres de Campos, A. Weidinger, Vacuum {\bf 39 (7-8)}, 860 (1989).

\section*{Communications}

\subsection*{Invited}

\item[24] ``Metastable hot nuclei in a semiclassical description'', A.\,H. Blin, Universidade de Coimbra, Portugal (1989).

\subsection*{Poster}

\item[25] ``PAC Studies of ZrMn2+x Alloys and their Hydrides'', L. P. Ferreira, J. M. Gil, P. J. Mendes, N. Ayres de Campos, L. Pontonnier, D. Fruchart, S. Miraglia, A. Baudry and P. Boyer,  (1989).

\item[26] ``Hydrogen and Deuterium Trapping at Nitrogen in Tantalum Studied by PAC'', P. J. Mendes, J. M. Gil, N. Ayres de Campos and A. Weidinger,  (1989).

\item[27] ``Hydrogen and Deuterium Trapping at Nitrogen in Tantalum Studied by PAC'', P. J. Mendes, J. M. Gil, N. Ayres de Campos and A. Weidinger,  (1989).

\section*{Other}

\item[28] ``Prefácio ao livro "O Jogo. As Leis Naturais que Regulam o Acaso", dos autores M. Eigen and R. Winkler'', C. Fiolhais, Lisbon: Gradiva (1989).

\item[29] ``Prefácio do livro "O Que é uma Lei Física", autor R. Feynman'', C. Fiolhais, Lisbon: Gradiva (1989).

\end{itemize}
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