@article{AIHPA_1978__29_4_357_0,
     author = {Guz, Wawrzyniec},
     title = {Filter theory and covering law},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {357--378},
     publisher = {Gauthier-Villars},
     volume = {29},
     number = {4},
     year = {1978},
     mrnumber = {525388},
     zbl = {0398.03052},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1978__29_4_357_0/}
}