@article{10_14708_ma_v43i2_813,
     author = {W{\l}adys{\l}aw Kulpa},
     title = {L*-operators of convexity},
     journal = {Mathematica Applicanda},
     pages = { 145--156},
     publisher = {mathdoc},
     volume = {43},
     number = {2},
     year = {2015},
     doi = {10.14708/ma.v43i2.813},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v43i2.813/}
}