Geodesic
On approximations of the groups, group actions and Hopf algebras
Zapiski Nauchnykh Seminarov POMI, Representation theory, dynamical systems, combinatorial and algoritmic methods. Part III, Tome 256 (1999), pp. 224-262 
M. A. Alekseyev; L. Yu. Glebskii; E. I. Gordon. On approximations of the groups, group actions and Hopf algebras. Zapiski Nauchnykh Seminarov POMI, Representation theory, dynamical systems, combinatorial and algoritmic methods. Part III, Tome 256 (1999), pp. 224-262. http://geodesic.mathdoc.fr/item/ZNSL_1999_256_a13/
@article{ZNSL_1999_256_a13,
     author = {M. A. Alekseyev and L. Yu. Glebskii and E. I. Gordon},
     title = {On approximations of the groups, group actions and {Hopf} algebras},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {224--262},
     year = {1999},
     volume = {256},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1999_256_a13/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

Continuing ideas of [15] we give new examples and criterias in the approximation theory.