@article{bwmeta1.element.desklight-b43781f6-f54e-43a0-bd69-a04551a2ba3b, author = {J. Perkal}, title = {Geometryczne wska\'zniki \l \k ak}, journal = {Applicationes Mathematicae}, volume = {2}, year = {1954}, pages = {133-149}, language = {pl}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-b43781f6-f54e-43a0-bd69-a04551a2ba3b} }
J. Perkal. Geometryczne wskaźniki łąk. Applicationes Mathematicae, Tome 2 (1954) pp. 133-149. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-b43781f6-f54e-43a0-bd69-a04551a2ba3b/