A developmental study of data envelopment analysis in measuring the efficiency of maintenance units in the U.S. air forces. - Abraham Charnes; C. T. Clark; William W. Cooper; B. Golany (Ann. Oper. Res., 1984)

Current Mode Techniques for Multiple Valued Arithmetic and Logic. - C. T. Clark; Graham R. Nudd; Stephen Summerfield (ISCAS, 1994)