K. Pilafidis-Williams, The Sanctuary of Aphaia on Aigina in the Bronze Age (Munich: Hirmer) 1998, describes the distinctive local cult but is cautious in retrojecting the later cult of Aphaia to describe Britomartis at Aigina; the explicit identification of Britomartis and Aphaea is in Pausanias, 2.30.3, and in Diodorus Siculus, v.76.3.
Pausanias, 10.36.5, saw on the high ground between the two cities "a sanctuary of Artemis surnamed Dictynnaean, a goddess worshipped with great reverence by citizens. The image is of Aeginetan workmanship, and made of a black stone."