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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 23, No. 1, pp. 52–55, January–February, 1971.
In conclusion the author expresses deep thanks to Yu. M. Berezanskii for guiding the work, and also to M. L. Gorbachuk for frequent discussions.
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Androshchuk, A.A. On transformation operators for a second-order differential equation with operator coefficients. Ukr Math J 23, 42–45 (1971). https://doi.org/10.1007/BF01086586
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DOI: https://doi.org/10.1007/BF01086586