1. Stout, D.F., and Kaufman, M.: Handbook of operational amplifier circuit design, (McGraw-Hill, New York 1976),section 9–2
2. Roberge, J.K.: Operational amplifiers; theory and practice, (Wiley, New York 1975), p. 450–451
3. Sheingold, D.H.: Analog-digital conversion handbook, (Analog Devices, Norwood, Mass. 1972), p. 111–134
4. Smith, J.I.: Modern operational circuit design, (Wiley, New York 1971), p. 124–126