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A. A. Albert Modern higher algebra, Chicago, 1937.

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P. Alexandroff and H. Hopf Topologie, vol. 1, Berlin, 1935.

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G. Birkhoff Lattice theory, Amer. Math. Soc. Colloquium Publications, vol. 25, New York, 1940. MR 0123490 (23:A815)

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M. Dresher and O. Ore Theory of multigroups, Amer. J. Math. vol. 60 (1938) pp. 705-733. MR 1507345

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J. E. Eaton and O. Ore Remarks on multigroups, Amer. J. Math. vol. 62 (1940) pp. 67-71. MR 0000629 (1:105c)

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H. G. Forder The foundations of Euclidean geometry, Cambridge, 1927.

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S. MacLane A lattice formulation for transcendence degrees and -bases, Duke Math. J. vol. 4 (1938) pp. 455-468. MR 1546067

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W. Prenowitz Projective geometries as multigroups, Amer. J. Math. vol. 65 (1943) pp. 235-256. MR 0008146 (4:251b)

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O. Veblen A system of axioms for geometry, Trans. Amer. Math. Soc. vol. 5 (1904) pp. 343-384. MR 1500678

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-The foundations of geometry, in Monographs on topics of modern mathematics, edited by J. W. A. Young, New York, 1915.

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B. L. van der Waerden Moderne Algebra, vol. 1, 1st ed., Berlin, 1930.