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V. A. Fock. . Mir Publishers, Moscow, 1978.

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E. Prugovečki. , volume 92 of [*Pure and applied mathematics*]{}. Academic Press, New York-London, second edition, 1981.

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Ronald F. Schutz. . Cambridge University Press, Cambridge-London-New York- New Rochelle-Melbourne-Sydney, 1982. (Russian translation: Mir, Moscow, 1984).

R. Coquereaux. , volume 16 of [*World Scientific Lecture Notes in Physics*]{}. World Scientific, Singapore-New York-Hong Kong, 1988.

N. P. Konopleva and V. N. Popov. . Harwood Academic Publishers, Chur-London-New York, second edition, 1981. (Original Russian edition: Atomizdat, Moscow, 1972 (1 ed.), 1980 (2 ed.)).

D. Husemoller. . McGraw-Hill Book Co., New York-St. Louis-San Francisco-Toronto-London-Sydney, 1966.

R. Hermann. . Marcel Dekker, Inc., New York, 1973.

R. Hermann. , volume I. W. A. Benjamin, Inc., New York, 1970.

