VT: An Expert Elevator Designer That Uses Knowledge-Based Backtracking. - Sandra Marcus; Jeffrey Stout; John P. McDermott (AI Mag., 1988)

Toward Automating Recognition of Differing Problem-Solving Demands. - Jeffrey Stout; Gilbert Caplain; Sandra Marcus; John P. McDermott (Int. J. Man Mach. Stud., 1988)