Golubitsky, Martin. Singularities and groups in bifurcation theory / by Martin Golubitsky and David G. Schaeffer - New York: Springer Verlag, 1984. - xvii, 463p. - Applied mathematical sciences ; 51 . ISBN: 3540909990 Subjects--Topical Terms: Banach spacesLinear ellipticMathUnfolding theory Dewey Class. No.: 515.353 / GOL/S