@article{10_4064_cm7409s_9_2017,
     author = {Andrzej Derdzi\'nski},
     title = {Witold {Roter} (1932{\textendash}2015)},
     journal = {Colloquium Mathematicum},
     pages = {1--8},
     publisher = {mathdoc},
     volume = {150},
     number = {1},
     year = {2017},
     doi = {10.4064/cm7409s-9-2017},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm7409s-9-2017/}
}