@article{JEDP_1999____A5_0,
     author = {Ivrii, Victor},
     title = {Accurate {Spectral} {Asymptotics} for periodic operators},
     journal = {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://www.numdam.org/item/JEDP_1999____A5_0/}
}