@article{ARM_1970__6_4_a3,
     author = {Rosenberg, Ivo},
     title = {Double lexicographic products},
     journal = {Archivum mathematicum},
     pages = {221--228},
     publisher = {mathdoc},
     volume = {06},
     number = {4},
     year = {1970},
     mrnumber = {0309829},
     zbl = {0251.08003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1970__6_4_a3/}
}