@incollection{JEDP_1999____A5_0, author = {Ivrii, Victor}, title = {Accurate {Spectral} {Asymptotics} for periodic operators}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {5}, pages = {1--11}, publisher = {Universit\'e de Nantes}, year = {1999}, mrnumber = {2000h:35125}, zbl = {01810578}, language = {en}, url = {http://archive.numdam.org/item/JEDP_1999____A5_0/} }