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Author(s): Leeuw, Edith de; Hox, Joop; Snijkers, Ger; Heer, Wim de.- 1998. 239-248p.
Author(s): Schwarz, Norbert; Strack, Fritz.- 1990. 35p.
Author(s): Porst, Rolf.- 1993. 32p.