1. Oral diadochokinesis in neurological dysarthrias;Ackermann;Folia Phoniatrica et Logopaedica,1995
2. Alshahwan, M., 2015. Speech Characteristics of Arabic Speakers: Dialect Variations. (Unpublished Ph.D Thesis). University of Sheffield.
3. Oral motor precision in older adults;Amerman;J. Natl. Stud. Speech Lang. Hear. Assoc.,1982
4. Diadochokinetic movements of nine-, ten-, and eleven-year old children;Blomquist;J. Speech Disorders,1950
5. Boersma, P., Weenink, D., 2013. Praat: doing phonetics by computer.