@mastersthesis {RN1061,
	title = {Social skills training with adults with mental retardation: An analysis of the ability of adults with mental retardation to perceive and interpret non-verbal facial expression},
	year = {1993},
	type = {phdThesis},
	keywords = {Social competence and social skills training Rasch IRT analysis},
	author = {Gumpel, Thomas}
}
