@article{701174,
     title = {On generalizations of Le\v snev's theorem},
     booktitle = {Abstracta. 8th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1980},
     pages = {42-43},
     url = {http://dml.mathdoc.fr/item/701174}
}

Chaber, J. On generalizations of Lešnev's theorem, dans Abstracta. 8th Winter School on Abstract Analysis, GDML_Books,  (1980), pp. 42-43. http://gdmltest.u-ga.fr/item/701174/