1. Versatile precision fullwave rectifier
2. GRAY , P. R. ,MEYER, R. C, 1984 ,Analysis and Design of Analog Integrated Circuits( Chichester , U.K. Wiley ) , chap. 10 , pp. 584 – 590 .
3. An improved current-mode instrumentation amplifier with bandwidth independent of gain
4. MEISKSIN , Z. H. ,THACKRAY, P. C, 1980 ,Electronic Design with Off-the-shelf Integrated Circuits( West Nyack , NY Parker ) , Chap. 6 , pp. 209 – 216 .