@inbook {1999,
	title = {Arable productivity in Flanders and the former territory of Belgium in a long-term perspective (from the Middle Ages to the end of the Ancien R{\'e}gime},
	booktitle = {Land productivity and agro-systems in the North Sea area (Middle Ages - 20th century). Elements for Comparison},
	series = {CORN Publication Series},
	volume = {2},
	year = {1999},
	pages = {30-64},
	publisher = {Brepols},
	organization = {Brepols},
	address = {Turnhout},
	isbn = {978-2-503-50962-4},
	issn = {2-503-50962-2},
	author = {Dejongh, Guy},
	editor = {Bavel, Bas J.P. van and Thoen, Erik}
}
@inbook {1999,
	title = {Arable yields and total arable output in the Netherlands from the late Middle Ages to the mid-19th century},
	booktitle = {Land productivity and agro-systems in the North Sea area (Middle Ages - 20th century). Elements for Comparison},
	series = {CORN Publication Series},
	volume = {2},
	year = {1999},
	pages = {85-112},
	publisher = {Brepols},
	organization = {Brepols},
	address = {Turnhout},
	isbn = {978-2-503-50962-4},
	issn = {2-503-50962-2},
	author = {Bavel, Bas J.P. van},
	editor = {Bavel, Bas J.P. van and Thoen, Erik}
}
