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2. H. Landt, and B Hedegard. (1974 ) Description of test pieces and test procedures for oral and manual form recognition test and test for oral muscular ability . Reports from the Department of Prosthetic Dentistry, Faculty of Odontology, University of Gothenburg, 1974:11.
3. H. Landt(1974 ) Oral and manual form recognition ability. Study la . Reports from the Department of Prosthetic Dentistry, Faculty of Odontology, University of Gothenburg, 1974:12.
4. H. Landt(1974 ) Oral and manual form recognition ability. Study lb . Reports from the Department of Prosthetic Dentistry, Faculty of Odontology, University of Gothenburg, 1974:13.