Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Tome 34 (1989)

Geodesic

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Nonlocal symmetries. Heuristic approach

I. Sh. Akhatov ; R. K. Gazizov ; N. Kh. Ibragimov

p. 3-83

Perturbation methods in group analysis

V. A. Baikov ; R. K. Gazizov ; N. Kh. Ibragimov

p. 85-147

Transformation groups in difference spaces

V. A. Dorodnitsyn

p. 149-191