TY  - BOOK
AU  - Helffer, Bernard,
TI  - Spectral theory and its applications
T2  - Cambridge studies in advanced mathematics ; 139
SN  - 9781107032309
U1  - 515.7222 HEL 
PY  - 2013///
CY  - Cambridge
PB  - Cambridge University Press
N1  - Includes bibliographical references and index
ER  -