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@phdthesis{Voorpostel2007,
author = "Voorpostel, M. B. J.",
title = "Sibling support. The exchange of help among brothers and sisters in the Netherlands",
year = 2007,
url = "http://ics.uda.ub.rug.nl/root/Dissertations/2007/VoorpostelMBJ-Siblin/"
}