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[1]
Dirac P. A. M., 1936, P ROYAL SOC LONDON S, V155, P447
[2]
EDDINGTON AS, 1930, MATH THEORY RELATIVI, P176
[4]
Fierz M., 1939, HELV PHYS ACTA, V12, P3
[5]
HARISHCHANDRA, 1946, P INDIAN ACAD SCI, V23, P152
[6]
SCHOUTEN JA, 1954, RICCI CALCULUS, P12
[7]
[No title captured]