@article{AUCMP_1987__28_2_a14,
     author = {Pokorn\'y, Imrich},
     title = {Symmetric selective derivatives},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {99--100},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1987},
     mrnumber = {0932746},
     zbl = {0643.26004},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_1987__28_2_a14/}
}