@article{CMH_1994__69_4_140340,
     author = {Christine Riedtmann},
     title = {Lie algebras and coverings.},
     journal = {Commentarii mathematici Helvetici},
     pages = {291--310},
     publisher = {mathdoc},
     volume = {69},
     number = {4},
     year = {1994},
     zbl = {0913.16007},
     url = {http://geodesic.mathdoc.fr/item/CMH_1994__69_4_140340/}
}