Geodesic
The closure of the set of classical Riemannian spaces
Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Itogi Nauki i Tekhniki. Seriya "Problemy Geometrii", Tome 21 (1989), pp. 43-66 
I. G. Nikolaev. The closure of the set of classical Riemannian spaces. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Itogi Nauki i Tekhniki. Seriya "Problemy Geometrii", Tome 21 (1989), pp. 43-66. http://geodesic.mathdoc.fr/item/INTG_1989_21_a2/
@article{INTG_1989_21_a2,
     author = {I. G. Nikolaev},
     title = {The closure of the set of classical {Riemannian} spaces},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {43--66},
     year = {1989},
     volume = {21},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1989_21_a2/}
}
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%D 1989
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