Superlinearly convergent methods for unconstrained minimization problems. - Klaus Ritter 002 (ACM Annual Conference (2), 1972)

Accelerating procedures for methods of conjugate directions. - Klaus Ritter 002 (Computing, 1975)

An Accelerated Conjugate Direction Method to Solve Linearly Constrained Minimization Problems. - Michael J. Best; Klaus Ritter 002 (J. Comput. Syst. Sci., 1975)

Local and superlinear convergence of a class of variable metric methods. - Klaus Ritter 002 (Computing, 1979)

A globally and quadratically convergent algorithm for general nonlinear programming problems. - Michael J. Best; Jürgen Bräuninger; Klaus Ritter 002; Stephen M. Robinson (Computing, 1981)

Linear Programming: Active Set Analysis and Computer Programs. - Michael J. Best; Klaus Ritter 002 (Prentice-Hall, 1985)

A quadratic programming algorithm. - Michael J. Best; Klaus Ritter 002 (ZOR Methods Model. Oper. Res., 1988)