An easy proof of Ponizovski's theorem.
Semigroup forum, Tome 15 (1977), pp. 181-182.

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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/}
}
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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/