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@misc{AMUC_1987__48-49_185955, title = {[unknown]}, journal = {Acta mathematica Universitatis Comenianae}, pages = {335--340}, publisher = {mathdoc}, volume = {48-49}, year = {1987}, url = {http://geodesic.mathdoc.fr/item/AMUC_1987__48-49_185955/} }
[unknown]. Acta mathematica Universitatis Comenianae, 48-49 (1987), pp. 335-340. http://geodesic.mathdoc.fr/item/AMUC_1987__48-49_185955/