by Waal, AG de, Willenborg, LCRJ
Published in Journal of official statistics (01.12.1997)

by De Waal, G A, Maritz, A, Scheepers, H, McLoughlin, S, Hempel, B
Published in International journal of organizational innovation (01.10.2014)

by Waal, AG de, Willenborg, LCRJ
Published in Journal of official statistics (01.12.1998)

by TEUNIS W. VAN STEENBERGEN, JAN A. G. DE WAAL
Year of Publication 14.12.1971