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Sib. Math. J. 15, 169-182 (1974); translation from Sib. Mat. Zh. 15, 243-261 (1974).
MSC:  47B15 47A20 47A70
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Sib. Math. J. 15, 234-241 (1974); translation from Sib. Mat. Zh. 15, 332-342 (1974).
MSC:  35G15 35E99 35B45 35D05
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