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	1.	Role of incentive strength in the discrimination learning of the retardate. [electronic resource] by Siegel, P S Forman, G E Producer: 19680210 In: Journal of comparative and physiological psychology vol. 63 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Visual decentration: from stereometric points to planeometric forms. [electronic resource] by Forman, G E Kuschner, D S Dempsey, J Producer: 19760123 In: Perceptual and motor skills vol. 41 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	An exploratory study of incentive motivation in the retardate. [electronic resource] by Siegel, P S Forman, G E Williams, J Producer: 19671002 In: American journal of mental deficiency vol. 71 Availability: No items available. Save to lists Add to cart (remove)
	4.	Instrumental behavior in the retardate in relation to qualitative variation in the incentive. [electronic resource] by Siegel, P S Williams, J Forman, G E Producer: 19680226 In: American journal of mental deficiency vol. 72 Availability: No items available. Save to lists Add to cart (remove)

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