@book{59685,
	author = {Dalvi, M Q and India. Planning Commission. UNDP Transport Policy Planning Project and Das, Tarun},
	title = {Test and calibration of gravity model for inter-state movements of coal and foodgrains in India},
	publisher = {The Author},
	year = {1981},
	address = {New Delhi},
	url = {https://library.niti.gov.in/cgi-bin/koha/opac-retrieve-file.pl?id=5dd593ff19fdde69f2bc2ec5dae37c6e}
}