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Kempter G, Beerbalk HD (1983) Wiss. Z. Paedagog. Hochsch. "Karl Liebnecht" Potsdam 27(1) 101-20. |
Haan J, Maat-Schieman ML. Roos RA (1994) Dementia 5 (3-4) 210-3. (Abstract). |
U.S. application No. 08/398188, Heinz, et al., filed Mar. 2, 1995 (co-pending application). |