@unpublished{HovhannisyanSchulze2010,
  author  = {A. H. Hovhannisyan and Bert-Wolfgang Schulze},
  title   = {On a method for solution of the ordinary differential equations connected with Huygens' equations},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2010) 01},
  year    = {2010},
}