1. V. V. Fokicheva, “Description of singularities for billiard systems bounded by confocal ellipses or hyperbolas”, Moscow University Mathematics Bulletin, 69:4 (2014), 148–158  mathnet  crossref  mathscinet
  2. V. V. Fokicheva, “Classification of billiard motions in domains bounded by confocal parabolas”, Sb. Math., 205:8 (2014), 1201–1221  mathnet  crossref  crossref  mathscinet  zmath  adsnasa  isi  elib
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