@book{28070,
	author = {Juan, Jorge, and Ulloa, Antonio de,},
	title = {Observaciones astronomicas y phisicas :},
	publisher = {en la Imprenta Real de la Gazeta,},
	year = {1773},
	address = {En Madrid :},
	note = {Segons Palau és segona ed.},
	url = {https://bipadiub.contentdm.oclc.org/digital/collection/astronomia/id/13203}
}