@article{AUCMP_2006__47_1_a3,
     author = {Trch, Milan},
     title = {Groupoids and the associative law. {VII.} {Semigroup} distance of {SH-groupoids}},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {57--63},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {2006},
     mrnumber = {2509895},
     zbl = {1150.20047},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_2006__47_1_a3/}
}