@misc{AUCMP_1991__32_1_a2,
     title = {[Foreword]},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     publisher = {mathdoc},
     volume = {32},
     number = {1},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1991__32_1_a2/}
}