Fattorini H.O., Kerber A. The Cauchy Problem
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(Russian.) Dokl. Akad. Nauk SSSR 170 (1966), 1024-1027. (MR 34,
#6274).
[1967: 1] Comparison theorems for fractional powers of operators. (Russian.)
Dokl. A kad. Nauk SSSR 174 (1967), 294-297. (MR 37, #2034).