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G. Bol, Gewebe und Gruppen, Math. Ann. 114 (1937), 414-431. MR 1513147

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R. H. Bruck, Contributions to the theory of loops, Trans. Amer. Math. Soc. 60 (1946), 245-354. MR 0017288 (8:134b)

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-, A survey of binary systems, Springer-Verlag, Berlin, 1958. MR 0093552 (20:76)

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-, What is a loop?, Studies in Modern Mathematics Vol. 2, Math. Assoc. America, Prentice-Hall, Englewood Cliffs, N. J., 1963, pp. 59-99

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J. M. Osborn, Loops with the weak inverse property, Pacific J. Math. 10 (1960), 295-404. MR 0111800 (22:2660)

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D. A. Robinson, Bol loops, Ph. D. Thesis, University of Wisconsin, Madison, Wis., 1964.