@inbook{f60b1981c7f949ec9d3d14138f33e0ff,
title = "De drie Grati{\"e}n of de schone Helena en haar lelijke zusters?",
abstract = "no abstract.",
author = "J. Wessels",
year = "1992",
language = "Nederlands",
series = "CQM Monograph",
publisher = "Centre for Quantitative Methods",
pages = "77--87",
editor = "L. Fortuin and M. Zijlstra and H. Besselaar and {Groot, de}, K.",
booktitle = "De kroonjuwelen : kwantitatieve modellen en methoden in verleden, heden en toekomst, Liber Amicorum voor dr. J.P.M. de Kroon",
}