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@misc{AMUC_1980__39_185807, title = {[unknown]}, journal = {Acta mathematica Universitatis Comenianae}, pages = {53--60}, publisher = {mathdoc}, volume = {39}, year = {1980}, url = {http://geodesic.mathdoc.fr/item/AMUC_1980__39_185807/} }
[unknown]. Acta mathematica Universitatis Comenianae, Tome 39 (1980), pp. 53-60. http://geodesic.mathdoc.fr/item/AMUC_1980__39_185807/