@article{AUCMP_1990__31_2_a0,
     author = {Balcar, B. and Preiss, D.},
     title = {Foreword},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     publisher = {mathdoc},
     volume = {31},
     number = {2},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1990__31_2_a0/}
}