00310nam a2200097Ia 4500008004100000082001900041245008000060260003300140300000600173440003300179260225b        |||||||| |||| 00| 0 eng d  a530.1bC748.MP  aConference and symposium in mathematical problems in theoretical physicsb/  aBerlin:bSpringer-Verlag,c   a   aLecture notes in Physicsv39