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@article{10_4064_am_2_2_133_149, author = {J. Perkal}, title = {Geometryczne wska\'zniki {\l}\k{a}k}, journal = {Applicationes Mathematicae}, pages = {133--149}, publisher = {mathdoc}, volume = {2}, number = {2}, year = {1954}, doi = {10.4064/am-2-2-133-149}, language = {pl}, url = {http://geodesic.mathdoc.fr/articles/10.4064/am-2-2-133-149/} }
J. Perkal. Geometryczne wskaźniki łąk. Applicationes Mathematicae, Tome 2 (1954) no. 2, pp. 133-149. doi : 10.4064/am-2-2-133-149. http://geodesic.mathdoc.fr/articles/10.4064/am-2-2-133-149/
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