But the unmistakable existence of any inverse relationship between frequency and linguistic complexity is a most precious discovery. This applies to all linguistic elements in so far as they convey information and to distinctive non-significant elements as well as to meaningful units, and it is perhaps advisable to illustrate their relationship first by reference to some phonological phenomena: the advantages of phonological illustration lies in the fact that everything is so much simpler there, with a definite number of phonemes per language and no necessity to reckon with meaning.
- Martinet (1962), a pag.144

The existence of an inverse relationship between frequency and linguistic complexity is abundantly illustrated on the plane of grammar.
- Martinet (1962), a pag.149