ISBN 0821803751 books & textbook
Four-Dimensional Integrable Hamiltonian Systems With Critical Points (Translations of Mathematical Monographs)
Lerman, Lev M. Umanskiy, Ya. L.
Amer Mathematical Society /1998-04-21 Hardcover / 177 Pages
isbn-10: 0821803751 / isbn-13: 9780821803752
