Dear Sir,
I would like to thank you for your invitation. I am writing my PhD thesis about "Design of enhanced piezoelectric materials", that could be very interesting to be included as a chapter in your new book.
However, I am a PhD student and I cannot proceed the payment of 670 euro as Processing charge.
I am sorry, I wished I could participate. Anyhow, thanks once again.
Sincerely yours,
Khaled