@article{IM2_1976_10_3_a6,
     author = {S. A. Orlov},
     title = {Nested matrix disks analytically depending parameter, and theorems on the},
     journal = {Izvestiya. Mathematics},
     pages = {565--613},
     year = {1976},
     volume = {10},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1976_10_3_a6/}
}