@article{AUCMP_1975__16_2_a6,
     author = {Je\v{z}ek, J. and Kepka, Tom\'a\v{s}},
     title = {Extensive varieties},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {79--87},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1975},
     mrnumber = {0382122},
     zbl = {0325.08003},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_1975__16_2_a6/}
}