Tatyana M. YakhnoE-mailyakhno@iis.nsk.suyakhno@cs.deu.edu.tr List of Articles: Yakhno T. Tekin M. Application of constraint hierarchy to timetabling problems // Computer Science. — 2001 . — # 16. — P. 67-78 Yakhno T. Petrov E. New facilities of constraint logic programming // Computer Science. — 1999 . — # 12. — P. 52-57