2 citations to https://www.mathnet.ru/eng/dan31599
  1. H. G. Ghazaryan, “On selection of infinitely differentiable solutions of a class of partially hypoelliptic equations”, Eurasian Math. J., 3:1 (2012), 41–62  mathnet  mathscinet  zmath
  2. A. D. Bruno, “Self-similar solutions and power geometry”, Russian Math. Surveys, 55:1 (2000), 1–42  mathnet  crossref  crossref  mathscinet  zmath  adsnasa  isi  elib