Paper  abstract   bibtex   

@misc{de_man_original_nodate,
	title = {Original {Documents} on the {History} of {Calculators}},
	url = {http://ajmdeman.awardspace.info/},
	abstract = {Documents et brevets sur les machines à calculer},
	urldate = {2013-12-09TZ},
	author = {de Man, Andries}
}