Looking for articles and or theories that explore the idea that morphology and syntax are not separate but operate on the same principles; for example, that the sentence is just an extended morphological word (using those terms generally, external of their various theoretical use).
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First, I'll point to a previous question on this SE, What meaningful distinction is there between morphology and syntax?. I'll just present one line of approach.
A seminal article is Mark Baker's 1985 The Mirror Principle and morphosyntactic explanation, wherein he defines the Mirror Principle as follows:
Subsequently, Distributed Morphology (DM) was developed by Morris Halle & Alec Marantz and colleagues. I quote from their 1993 paper, Distributed Morphology and the pieces of inflection (pdf):
Two points: first, it is in a sense the opposite of what you mention in your question, in that a morphologically derived word is claimed to have internal syntactic structure. Second, DM is not pure syntax (hence the "Distributed" label): it does have a number of post-syntactic operations that derives morphological generalizations such as syncretism (where different morphosyntactic feature bundles like first person singular and second person singular are realized by the same morpheme).
There are a number of resources for DM:
If one focuses on morphosyntax (inflectional morphology), the differences might be hard to spot. On the other hand, morphological creation of new words (derivational morphology) seems to rely on some different principles. For example:
Human language users commit some things about their language to memory, but for other matters, they wing it. The memorized things must be finite in number, of course, because we have only a finite amount of time to memorize and a finite capacity to store memories. But the rest of the language, which we create and understand ad hoc, from expression to expression, is infinite.
We memorize words, but deal with phrases ad hoc, for the most part. The number of words is finite (pace Langendoen and Postal in The Vastness of Natural Languages), while the number of phrases is infinite. Morphology describes words, a finite list of things, but syntax must describe the infinity of phrases, so syntax and morphology must differ in a fundamental way.
Sorry I didn't answer your question.