Graham, R. L., Rothschild, B. L. and Spencer, J. H., Ramsay Theory. (Sec. Ed.) John Wiley & Sons, New York, Chichester, Brisbane, Toronto, Singapore, 1990, 196 pp., £39.30, ISBN 0-471-50046-1.Cellina, A. (ed.), Methods of Nonconvex Analysis. Lectures given at the 1st Session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held at Varenna, Italy, June 15-23, 1989. Lecture Notes in Mathematics, Vol. 1446. Springer-Verlag Berlin, Heidelberg, New York, Tokyo 1990, VI + 206 pp., DM 37, -, ISBN 3-540-53120-3.Häammerlin, G. and Hoffmann, K.-H., Numerische Mathematik. (Grundwissen Mathematik, Bd. 7). Springer-Verlag Berlin, Heidelberg, New York 1989, 448 pp., DM 38, -, ISBN 3-540-15306-3.Wiggins, S., Introduction to Applied Nonlinear Dynamical Systems and Chaos. Springer-Verlag Berlin, Heidelberg, New York, 1990, 672 pp., DM 98, -, ISBN 3-540-97003-7Remmert, R., Funktionentheorie 11. Springer-Verlag Berlin, Heidelberg, New York 1991, 19 Abb., XIX, 299 pp., DM 48, -, ISBN 3-540-12783-6.Peitgen, H. O., Jäurgens, H., Saupe, D., Maletsky, E., Perciante, T. and Yunker, L., Fractals for the Classroom: Strategic Activites Volume One. Springer Verlag New York, Berlin, Heidelberg, London, Paris, Tokyo, Hong Kong , Barcelona. 128 pp., DM 38, -, ISBN 3-540-97346-X.