Greenstreet v. Clark , 239 N.W.2d 143 ( 1976 )
Wehling v. Rottinghaus , 204 N.W.2d 592 ( 1973 )
Heyer v. Peterson , 307 N.W.2d 1 ( 1981 )
Sheer Construction, Inc. v. W. Hodgman & Sons, Inc. , 326 N.W.2d 328 ( 1982 )