Graff A A

Publications in Math-Net.Ru

1. То the theory of linear differential systems in one-dimensional domains. II
   
   Rec. Math. [Mat. Sbornik] N.S., 21(63):1 (1947),  143–159
2. То the theory of linear differential systems in one-dimensional domain
   
   Rec. Math. [Mat. Sbornik] N.S., 18(60):2 (1946),  305–328