Geodesic
The solution of the Cauchy problem for a first order linear differential equation with operator coefficients
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 1 
G. A. Suvorchenkova. The solution of the Cauchy problem for a first order linear differential equation with operator coefficients. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 1. http://geodesic.mathdoc.fr/item/RM_1976_31_1_a22/
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[5] E. A. Fadeeva, “O zadache Koshi dlya lineinogo giperbolicheskogo uravneniya pervogo poryadka s operatornymi koeffitsientami”, UMN, 22:2 (134) (1967) | MR