@incollection{JEDP_1987____A20_0,
     author = {Ivrii, Victor},
     title = {Estimates for a number of negative eigenvalues of the {Schr\"odinger} operator with intensive magnetic field},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {20},
     pages = {1--7},
     publisher = {Ecole polytechnique},
     year = {1987},
     language = {en},
     url = {http://www.numdam.org/item/JEDP_1987____A20_0/}
}