@techreport{Willekens1979,
author = {Willekens, F.},
title= {Computer program for increment-decrement (multistate) life table analysis: a user's manual to LIFEINDEC. Working Paper WP-79–102},
year = {1979},
URL = {http://depot.knaw.nl/2495/ 
%[21 March 2014},
publisher = {International Institute for Applied Systems Analysis},
address = {Laxenburg, Austria},
}