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@misc{AMUC_1987__50-51_185984, title = {[unknown]}, journal = {Acta mathematica Universitatis Comenianae}, pages = {267--273}, publisher = {mathdoc}, volume = {50-51}, year = {1987}, url = {http://geodesic.mathdoc.fr/item/AMUC_1987__50-51_185984/} }
[unknown]. Acta mathematica Universitatis Comenianae, 50-51 (1987), pp. 267-273. http://geodesic.mathdoc.fr/item/AMUC_1987__50-51_185984/