@article{MS2_1970__26_166122,
     author = {Larry Smith},
     title = {Split {Extensions} of {Hopf} {Algebras} and {Semi-Tensor} {Products.}},
     journal = {Mathematica Scandinavica},
     pages = {17--41},
     publisher = {mathdoc},
     volume = {26},
     year = {1970},
     zbl = {0191.53902},
     url = {http://geodesic.mathdoc.fr/item/MS2_1970__26_166122/}
}