2 citations to https://www.mathnet.ru/rus/sm2468
  1. N. K. Bose, Multidimensional Systems Theory, 1985, 1  crossref
  2. Galeev R., “Cauchy-Problem for Passive Systems in Hilbert-Space”, Differ. Equ., 18:10 (1982), 1233–1237  mathnet  mathscinet  isi