@article{10_4064_ba8107_4_2017,
     author = {Zbigniew Lipecki},
     title = {Historical remarks on equivalence of functions},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {93--95},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {2017},
     doi = {10.4064/ba8107-4-2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba8107-4-2017/}
}