The derivational formations may [...] be divided between formations of the nuclei (these are the compounds) and constructions consisting of nuclei and nonnuclei.
- Nida (1949), a pag.98

Certain sequence classes do not exhibit determiner or determined constituents. These are compounds, i.e. combinations of nuclei. According to the terminology we are employing, such sequence classes do not constitute structural series, but they have structural similarities which make it possible and necessary to describe them by classes.
- Nida (1949), a pag.127

The first task in a descriptive analysis of compounds is to determine the external distribution classes. Then the compounds are classified according to internal structure. The internal structure is analyzed first in terms of distribution classes and secondly in terms of allomorphic alternation.
- Nida (1949), a pag.127