1.
Introduction to Spectral Theory With Applications to Schrodinger Operators
by Hislop, P. D., Sigal, I. M.
ISBN: 9780387945019
List Price: $132.00
2.
Introduction to Spectral Theory
by Hislop, P. D., Sigal, I. M.
ISBN: 9781461207429
List Price: $24.99