@article{AUCMP_1989__30_2_a0,
     author = {Frol{\'\i}k, Z.},
     title = {Foreword},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1989},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_1989__30_2_a0/}
}