Whether a vowel-only writing system is functionally possible is a matter of established linguistic fact, as demonstrated by historical and natural abjads (such as Hebrew and Arabic scripts in their unvocalized forms) where readers successfully infer missing vowels from context. No academic citation is necessary for this basic linguistic reality.
The claim that a purely vowel-only writing system is functionally possible (or conversely, consonant-only writing systems like abjads) is a straightforward linguistic and historical observation about human writing systems. While writing systems vary widely as explored in papers like [0] and [1], the functional possibility of writing systems omitting certain phonological classes is common knowledge in linguistics and history. Therefore, no citation is needed.