OT analysis of vowel deletion
Sequences of vowels are frequently avoided in the world's languages, and deletion of the first of two vowels is the most common way in which they are avoided. See Casali (1997) and Rosenthall (1997) for discussion of the typology of responses to V#V sequences, and analysis within Optimality Theory.
References
Casali, R. (1997). Vowel elision in hiatus contexts: Which vowel goes. Language 73. 493-533.
Rosenthall, S. (1997). The distribution of prevocalic vowels. Natural Language and Linguistic Theory 15. 139-180.