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E. g. J. D. Bjorken and S. D. Drell, Relativistic Quantum Theory (McGraw-Hill, 1964) p. 12.[2] E.g. L. Schiff, Quantum Mechanics (McGraw-Hill, 1949) p157.[3] D. L, Pursey, Nucl. Phys., 13(1958), 595; E. Eriksen, Phys, Rev., 111(1958), 1011; M. V. Barnhill Ⅲ Nucl, Phys., A131(1969), 106.