The double-deficit theory of dyslexia[1][2] proposes that a deficit in two essential skills gives rise to the lowest level of reading performances, constituting the most severe form of dyslexia.
^Wolf, M. & Bowers, P. (1999). "The "Double-Deficit Hypothesis" for the developmental dyslexias". Journal of Educational Psychology, 91, 1-24. ((cite journal)): Cite journal requires |journal= (help)
^Bowers PG. Wolf M. (1993). Theoretical links among naming speed, precise timing mechanisms and orthographic skill in dyslexia. Reading and Writing, 5:69-85. doi:10.1007/BF01026919