@book{556,
	author = { Basu, Baidyanath  and Chattopadhyay, Tanuka [auth.]},
	title = {An introduction to astrophysics / Baidyanath Basu, Tanuka Chattopadhyay & Sudhindra Nath Biswas.},
	address = {Delhi: PHI Learning, 2021.},
	edition = {2nd ed.}
}