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@article{SF_1980__20_134408, author = {J.H. Carruth and C.E. Clark}, title = {Generalized {Greenfs} theories.}, journal = {Semigroup forum}, pages = {95--128}, publisher = {mathdoc}, volume = {20}, year = {1980}, zbl = {0438.20045}, url = {http://geodesic.mathdoc.fr/item/SF_1980__20_134408/} }
J.H. Carruth; C.E. Clark. Generalized Greenfs theories.. Semigroup forum, Tome 20 (1980), pp. 95-128. http://geodesic.mathdoc.fr/item/SF_1980__20_134408/