Newly available from SIL is The Article in Post-classical Greek, edited by Daniel King. According to the publisher,
The collection presented here offers interpretations of the functions and grammar of the Greek article (ὁ, ἡ, τό) from a variety of perspectives, including generative grammar and discourse analysis, along with studies that make use of text-critical and diachronic data. Together, these supply readers of Greek with a thorough understanding of the functions of the article and constitute a starting point for further research efforts.
HT: Mike Aubrey