Dubrovin, B.A Fomenko, A.T Modern geometry methods and applications: part I. the geometry of surfaces,transformation groups and fields - New York Springer-Verlag 1984 - xv,464 p. 22cm. PB - Graduate texts in mathematics . ISBN: 0387908722 Subjects--Uniform Titles: Geomentry Dewey Class. No.: 516 / DUB