@article{10_21136_CMJ_1976_101369,
     author = {Bure\v{s}, Jarol{\'\i}m},
     title = {Free constructions of 2-structures},
     journal = {Czechoslovak Mathematical Journal},
     pages = {20--29},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1976},
     doi = {10.21136/CMJ.1976.101369},
     mrnumber = {0467504},
     zbl = {0328.50005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1976.101369/}
}