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V. Ya. Sikiryavyi, “The solution of boundary value problems related to a pseudospherical differential operator,” Usp. Mat. Nauk,25, No. 6 (1970).
V. Ya. Sikiryavyi, “The theory of boundary value problems for equations with a pseudospherical differential operator,” Usp. Mat. Nauk,26, No. 4 (1971).
I. Ya. Dorfman, “On means and the Laplacian of functions on Hilbert space,” Matem. Sb.,81, No. 2 (1970).
E. M. Polishchuk, Continual Means and Questions of Analysis in Function Spaces, Author's Abstract of Doctoral Dissertation [in Russian], Moscow (1969).
P. Lévy, Concrete Problems of Functional Analysis [Russian translation], Nauka, Moscow (1967).
Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 25, No. 3, pp. 406–409, May–June, 1973.
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Sikiryavyi, V.Y. Boundary value problems for a multiplicatively generated quasidifferential operator. Ukr Math J 25, 334–337 (1973). https://doi.org/10.1007/BF01091888