This article provides a philological and linguistic commentary on the forms βόλβιτον and βόλιτον discussed in the lexica Phryn. Ecl. 334, Antiatt. β 44, Moer. β 14, Hdn. Philet. 41, Philemo (Laur.) 356, and Thom.Mag. 55.14.
Federica Benuzzi (Wed,) studied this question.