Geodesic
The group $G_2(\mathbb{C})$ in connection with the theory of metaplectic forms
Zapiski Nauchnykh Seminarov POMI, Automorphic functions and number theory. Part III, Tome 162 (1987), pp. 169-185 
N. V. Proskurin. The group $G_2(\mathbb{C})$ in connection with the theory of metaplectic forms. Zapiski Nauchnykh Seminarov POMI, Automorphic functions and number theory. Part III, Tome 162 (1987), pp. 169-185. http://geodesic.mathdoc.fr/item/ZNSL_1987_162_a5/
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     author = {N. V. Proskurin},
     title = {The group $G_2(\mathbb{C})$ in connection with the theory of metaplectic forms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {169--185},
     year = {1987},
     volume = {162},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_162_a5/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

Some preliminary information which makes the consideration of metaplectic forms on $G_2(\mathbb{C})$ possible is recounted.