@article{JLT_2012_22_1_JLT_2012_22_1_a11,
     author = {B. Ion },
     title = {A {Poincar�-Birkhoff-Witt} {Theorem} for {Hopf} {Algebras} with {Central} {Hopf} {Algebra} {Coradical}},
     journal = {Journal of Lie theory},
     pages = {291--3},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {2012},
     url = {http://geodesic.mathdoc.fr/item/JLT_2012_22_1_JLT_2012_22_1_a11/}
}