@article{10_1007_s10587_012_0032_7,
     author = {Je\v{z}ek, Jaroslav},
     title = {Definability for equational theories of commutative groupoids},
     journal = {Czechoslovak Mathematical Journal},
     pages = {305--333},
     publisher = {mathdoc},
     volume = {62},
     number = {2},
     year = {2012},
     doi = {10.1007/s10587-012-0032-7},
     mrnumber = {2990179},
     zbl = {1265.08013},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.1007/s10587-012-0032-7/}
}