@article{AUCMP_1999_40_2_a1,
     author = {Holick\'y, Petr and Balcar, Bohuslav},
     title = {Foreword},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {21},
     year = {1999},
     volume = {40},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1999_40_2_a1/}
}