1. Polovinkin , A. I. Automatization of creative design , Radio i Svyaz , Moscow , 1981 ( in Russian ).
2. Pospelov , D. A. Situative control: Theory and practice , Nauka , Moscow , 1986 ( in Russia ).
3. et al. Decision-making models based on linguistic variables . Zinatne , Riga , 1982 ( in Russian ).