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@article{AM2_1981__23_136913, author = {S.S. Sane}, title = {On the theorems of {Drake} and {Lenz.}}, journal = {Aequationes mathematicae}, pages = {223--232}, publisher = {mathdoc}, volume = {23}, year = {1981}, zbl = {0512.51012}, url = {http://geodesic.mathdoc.fr/item/AM2_1981__23_136913/} }
S.S. Sane. On the theorems of Drake and Lenz.. Aequationes mathematicae, Tome 23 (1981), pp. 223-232. http://geodesic.mathdoc.fr/item/AM2_1981__23_136913/