$1!R7!a,!0d!CUKN7!ON (B/ s - VosJohannes G.; $1!ZO!04![Hs ($1!T+!4I!<D (B: s $1!8<!M^3BD!B>!_z!:l!RY!YF!Na!3K!JH!\k(B, s, 1982)