@article{10_14708_am_v12i1_6406,
     author = {Lech Maligranda and Jan Strelcyn},
     title = {Jan {Ptaszycki} (1854-1912)},
     journal = {Antiquitates Mathematicae},
     pages = { 31--80},
     publisher = {mathdoc},
     volume = {12},
     year = {2018},
     doi = {10.14708/am.v12i1.6406},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/am.v12i1.6406/}
}