@article{JLT_1991_1_2_a1,
     author = {K. Schmuedgen},
     title = {Non-Commutative {Covariant} {Differential} {Calculus} on {Quantum} {Spaces} and {Quantum} {Groups}},
     journal = {Journal of Lie theory},
     pages = {125--134},
     publisher = {mathdoc},
     volume = {1},
     number = {2},
     year = {1991},
     url = {http://geodesic.mathdoc.fr/item/JLT_1991_1_2_a1/}
}