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@article{SF_1977__14_186380, author = {H.J. Shyr and C. M. Reis}, title = {A note on a problem of {Hua.}}, journal = {Semigroup forum}, pages = {7--14}, publisher = {mathdoc}, volume = {14}, year = {1977}, zbl = {0358.20066}, url = {http://geodesic.mathdoc.fr/item/SF_1977__14_186380/} }
H.J. Shyr; C. M. Reis. A note on a problem of Hua.. Semigroup forum, Tome 14 (1977), pp. 7-14. http://geodesic.mathdoc.fr/item/SF_1977__14_186380/