BERESTYCKI, Variational Methods : Proceedings of a Conference Paris, June 1988. Softcover reprint of the original 1st ed. 1990. (Progress in Nonlinear Differential Equations and Their Applications) 478 pp. (Springer-Verlag New York Inc., US) ＜M25-18071＞

Bryant, Robert L. / Chern, S.S. / Gardner, Robert B. / Goldschmidt, Hubert L. / Griffiths, P.A., Exterior Differential Systems. Softcover reprint of the original 1st ed. 1991. (Mathematical Sciences Research Institute Publications) 475 pp. (Springer-Verlag New York Inc., US) ＜M25-18064＞

Akbulut, Selman / King, Henry, Topology of Real Algebraic Sets. Softcover reprint of the original 1st ed. 1992. (Mathematical Sciences Research Institute Publications) 249 pp. (Springer-Verlag New York Inc., US) ＜M25-18068＞