J. Varghese, N. Joseph, H. Jantunen, Multilayer glass-ceramics/Ceramic composite substrates, Encyclopedia of Materials: Technical Ceramics and Glasses, Volume 3, 2021, page 437-451.

Encyclopedia of Materials: Technical Ceramics and Glasses | ScienceDirect 

J. Varghese , N. Joseph a, H. Jantunen a, S. K. Beherab, H. T. Kim c and M. T. Sebastian, Microwave Materials for Defense and Aerospace Applications, Springer, 2020. 

https://www.springerprofessional.de/en/microwave-materials-for-defense-and-aerospace-applications/18459372

H. Ohsato, J. Varghese, and H. Jantunen, Dielectric   Losses of Microwave Ceramics Based on Crystal   Structure, Intech Open, 2019. 

https://www.intechopen.com/books/electromagnetic-materials-and-devices/dielectric-losses-of-microwave-ceramics-based-on-crystal-structure   

J. Varghese and Mailadil Thomas Sebastian, Dielectric Inks, Chapter 10 in Microwave Materials and Applications, Willey Publisher, 2017. 

https://onlinelibrary.wiley.com/doi/10.1002/9781119208549.ch10

J. Varghese, Zircon Based Hard, Soft Microwave Substrates and Devices,  LAP LAMBERT Academic Publishing, Germany, 2016. 

https://www.amazon.com/Zircon-Based-Microwave-Substrates-Devices/dp/3659973343