@book{21903,
	author = {Piaggio,H.T.H.},
	title = {An Elementary Treatise On Differential Equations and Their Application},
	publisher = {CBS Publishers},
	year = {2004},
	address = {New Delhi},
	url = {https://libgen.is/book/index.php?md5=B898B2A59A4E3A48E46C8DA3D3CAF0FE}
}