@article{MM2_1972__7_154119,
     author = {Mitsuhiro Takeuchi},
     title = {A {Correspondence} between {Hopf} {Ideals} and {Sub-Hopf} {Algebras.}},
     journal = {Manuscripta mathematica},
     pages = {251--270},
     publisher = {mathdoc},
     volume = {7},
     year = {1972},
     zbl = {0238.16011},
     url = {http://geodesic.mathdoc.fr/item/MM2_1972__7_154119/}
}