@article{AULFM_1991_04_a7,
     author = {Cel, Jaros{\l}aw},
     title = {Archiwum zmian \'srodowiska naturalnego okresu prze{\l}omu pl},
     journal = {Acta Universitatis Lodziensis. Folia Mathematica},
     publisher = {mathdoc},
     volume = {04},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AULFM_1991_04_a7/}
}