In Greek 'μένο' ‘I remain’, 'μεμένηκα' ‘I have remained’, 'λύω' ‘I loose’, 'λέλυκα' ‘I have loosed’, the meaning of the reduplication is the same in all cases, but the phonemic sequences vary so much that they are not commonly considered to constitute a single morpheme. Instead, reduplication is often called a morphological process, a special kind of affix, and the like.
- Harris (1942a), Pag. 170

In the proposed method, reduplication is described as a group of morpheme alternants, grouped into a unit, between whose members a particular kind of difference exists […].
- Harris (1942a), Pag. 172