@article{RMF_2018_93_1_a4,
     author = {Jedin\'ak, Du\v{s}an},
     title = {Listy z kalend\'ara. {Max} {Karl} {Ernst} {Ludwig} {Planck}},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {37--38},
     year = {2018},
     volume = {93},
     number = {1},
     language = {sk},
     url = {http://geodesic.mathdoc.fr/item/RMF_2018_93_1_a4/}
}