Authors: Heijke, Hans Beekman, Theo De Grip, Andries Dekker, Ron

Citation: Hans Heijke et al., An Explanation of the Educational Structure of Occupations, Labour, (3), 1991, pp. 151

Authors: De Grip, Andries Dekker, Ron Heijke, H.

Citation: Andries De Grip et al., An Explanation of the Occupational Structure of Sectors of Industry, Labour, (3), 1990, pp. 3