Line-drawing recognition: Russian and German approaches
@TechReport{ablameykoTR9702,
  author = 	 {S. Ablameyko and Th. B{"u}low and G. Sommer},
  title = 	 {Line-drawing recognition: Russian and {G}erman approaches},
  institution =  {Institut f. Informatik und Praktische Mathematik},
  year = 	 1997,
  number =	 9702,
  month =	 {January}
}