Mr. Selvam (Emp Id : 000217), Technical Officer wrote a book name –  “Design of analog multipliers with operational amplifiers” and published by CRC Press, Taylor & Francis, United States of America. The book is available at the following links:

https://www.bookdepository.com/Design-Analog-Multipliers-with-Operational-Amplifiers-K-C-Selvam/9780367228941?ref=grid-view

https://www.vitalsource.com/de/en-GB/products/design-of-analog-multipliers-with-operational-k-c-selvam-v9781000024487

https://www.bokus.com/bok/9780367228941/design-of-analog-multipliers-with-operational-amplifiers/

https://www.amazon.com/dp/0367228947