Engelstad, Steve; Falck, Keith; Montgomery, Warren; Neumann, Joe; Straubs, Ralph; Vandendorpe, Jim; Wilde, Mike "A Dynamic C-Based Object-Oriented System for Unix"

(1991) IEEE Software 8(3) May 1991  

Languages mentioned C {1972} Unix systems programming language C+@ {1991} Simplified C Calico {1991}