ISBN 052177912X books & textbook
Singular Perturbations of Differential Operators: Solvable Schrödinger-type Operators (London Mathematical Society Lecture Note Series, Series Number 271)
Albeverio, S. Kurasov, P. Kuracov
Cambridge University Press /2000-03-13 Paperback / 444 Pages
isbn-10: 052177912X / isbn-13: 9780521779128
