@article{AUCMP_2007__48_2_a6,
     author = {Kulpa, W{\l}adys{\l}aw and Szyma\'nski, Andrzej},
     title = {Theorem on signatures},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {55--67},
     publisher = {mathdoc},
     volume = {48},
     number = {2},
     year = {2007},
     mrnumber = {2512903},
     zbl = {1160.54027},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_2007__48_2_a6/}
}