Problems #51 and #52.
Semigroup forum, Tome 13 (1976), p. 281.

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@article{SF_1976__13_134222,
     author = {B. Fuchssteiner},
     title = {Problems #51 and #52.},
     journal = {Semigroup forum},
     pages = {281--281},
     publisher = {mathdoc},
     volume = {13},
     year = {1976},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134222/}
}
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EP  - 281
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UR  - http://geodesic.mathdoc.fr/item/SF_1976__13_134222/
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%T Problems #51 and #52.
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B. Fuchssteiner. Problems #51 and #52.. Semigroup forum, Tome 13 (1976), p. 281. http://geodesic.mathdoc.fr/item/SF_1976__13_134222/