@article{FPM_2001_7_3_a4,
     author = {E. E. Demidov},
     title = {Schur pairs, non-commutative deformation of the {Kadomtsev--Petviashvili} hierarchy and skew differential operators},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {683--698},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2001_7_3_a4/}
}