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@article{SF_1977__15_134248, author = {M. Gould}, title = {An easy proof of {Ponizovski's} theorem.}, journal = {Semigroup forum}, pages = {181--182}, publisher = {mathdoc}, volume = {15}, year = {1977}, zbl = {0381.20050}, url = {http://geodesic.mathdoc.fr/item/SF_1977__15_134248/} }
M. Gould. An easy proof of Ponizovski's theorem.. Semigroup forum, Tome 15 (1977), pp. 181-182. http://geodesic.mathdoc.fr/item/SF_1977__15_134248/