@book{61870,
	author = {Jha, Deepak Kumar},
	title = {Comparative study of features of Delphion, QPAT, derwent innovation index (DII) and world intellectual property system (WIPS) of patent databases },
	publisher = {CSIR-NISCAIR / CSIR-NIScPR, },
	address = {New Delhi:}
}