@article{ZNSL_1990_183_a5,
     author = {N. V. Proskurin},
     title = {On some discrete subgroups of the exceptional group $G_2(\mathbb{C})$, in connection with {Eisenstein} series},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {124--141},
     year = {1990},
     volume = {183},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1990_183_a5/}
}