@book{507,
	author = {Takayama, Akira},
	title = {Analytical methods in economics},
	publisher = {The University of Michigan Press},
	year = {1993},
	address = {Michigan :},
	url = {https://biblioeco.unsa.edu.ar/pmb/images/libros/Analytical methods in economics  Takayama, Akira (1993) .jpg}
}