@article{10_14708_wm_v19i01_3258, author = {. .}, title = {Kr\'otkie informacje}, journal = {Wiadomo\'sci Matematyczne}, pages = { 68--71}, publisher = {mathdoc}, volume = {19}, number = {01}, year = {1975}, doi = {10.14708/wm.v19i01.3258}, language = {pl}, url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v19i01.3258/} }