Ravindran, G. Almost N-matrices and linear complementarity. Linear Algebra Appl. 145 (1991), 107--125. z Parthasarathy, T. ; Ravindran, G. A class of globally univalent differentiable mappings. Arch. Math. (Brno) 26 (1990), no. 2-3, 165--172. z Meisters, Gary H. A Jacobian condition for injectivity of differentiable plane maps. Ann. Polon. Math. 51 (1990), 249--254. z Lasota, A. Zdzisƚaw Opial---a mathematician (1930--1974). Ann. Polon. Math. 51 (1990), 7--13. The Lyapunov theorem: its extensions and applications. Methods of nonconvex analysis (Varenna, 1989), 84--103, Lecture Notes in Math., 1446, Springer, Berlin, 1990. Global diffeomorphism question and differential equations. Qualitative theory of differential equations (Szeged, 1988), 465--471, Colloq. Math. Soc. János Bolyai, 53, North-Holland, Amsterdam, 1990. z Meisters, Gary H. Solution of the global asymptotic stability Jacobian conjecture for the polynomial case. Analyse mathématique et applications, 373--381, Gauthier-Villars, Montrouge, 1988. z Meisters, Gary H. A poly-flow formulation of the Jacobian conjecture. Bull. Polish Acad. Sci. Math. 35 (1987), no. 11-12, 725--731. Global asymptotic stability and global univalence on the plane.