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Ferngren H, Lagergren J. Classification of handicaps in 6-7-year-old mentally retarded children. Usefulness and inter-observer agreement of a child adapted handicap code of WHO's ICIDH. Int Disabil Stud. 1988;10(4):155-8doi: 10.3109/09638288809164067.
Ferngren, H., & Lagergren, J. (1988). Classification of handicaps in 6-7-year-old mentally retarded children. Usefulness and inter-observer agreement of a child adapted handicap code of WHO's ICIDH. International disability studies, 10(4), 155-8. https://doi.org/10.3109/09638288809164067
Ferngren, H, and Lagergren, J. "Classification of handicaps in 6-7-year-old mentally retarded children. Usefulness and inter-observer agreement of a child adapted handicap code of WHO's ICIDH." International disability studies vol. 10,4 (1988): 155-8. doi: https://doi.org/10.3109/09638288809164067
Ferngren H, Lagergren J. Classification of handicaps in 6-7-year-old mentally retarded children. Usefulness and inter-observer agreement of a child adapted handicap code of WHO's ICIDH. Int Disabil Stud. 1988;10(4):155-8. doi: 10.3109/09638288809164067. PMID: 2976755.
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