1. Ph.D., JSPS International Research Fellow, Okinawa International University Graduate School of Regional Culture Ginowan City, Okinawa Japan
2. Ph.D., Department of Linguistics, SOAS, University of London https://dx.doi.org/3163 London UK
3. Ph.D., Professor, Department of Asian and North-African Studies, Ca’ Foscari University of Venice https://dx.doi.org/19047 Venice Italy