@article{10_21136_CMJ_1972_101131,
     author = {Bure\v{s}, Jarol{\'\i}m},
     title = {Deformation and equivalence $G$-structures. {Part} {I.} $\{e\}$-structures},
     journal = {Czechoslovak Mathematical Journal},
     pages = {641--652},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1972},
     doi = {10.21136/CMJ.1972.101131},
     mrnumber = {0309002},
     zbl = {0246.53033},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1972.101131/}
}