@article {heeffer2008text,
	title = {Text production, reproduction and appropriation within the abbaco tradition: a case study},
	journal = {SCIAMVS},
	volume = {9},
	year = {2008},
	pages = {101-145},
	author = {Heeffer, Albrecht}
}
@article {382923,
	title = {The tacit appropriation of {H}indu algebra in renaissance practical arithmetic},
	journal = {Ganita Bharati},
	volume = {29},
	number = {1-2},
	year = {2007},
	pages = {1{\textendash}60},
	issn = {0970-0307},
	author = {Heeffer, Albrecht}
}
