@article{10_21136_CPM_1968_108574,
     author = {Lipi\'nski, Jan Stanis{\l}aw},
     title = {Sur la classe ${\cal M}'_2$},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {222--226},
     publisher = {mathdoc},
     volume = {093},
     number = {2},
     year = {1968},
     doi = {10.21136/CPM.1968.108574},
     mrnumber = {0233940},
     zbl = {0159.35003},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1968.108574/}
}