Piyasawat Navaratana Na Ayudhya. 2011. Multi-rating electronic ballast for fluorescent lamps based on operating frequency determination. , King mongkut’s university of technology thonburi; DOI : https://doi.nrct.go.th/ListDoi/listDetail?Resolve_DOI=10.14457/KMUTT.the.2011.213

Piyasawat Navaratana Na Ayudhya. Multi-rating electronic ballast for fluorescent lamps based on operating frequency determination. . Bangkok:King mongkut’s university of technology thonburi, 2011. DOI : https://doi.nrct.go.th/ListDoi/listDetail?Resolve_DOI=10.14457/KMUTT.the.2011.213

Piyasawat Navaratana Na Ayudhya. (2011) Multi-rating electronic ballast for fluorescent lamps based on operating frequency determination . King mongkut’s university of technology thonburi/Bangkok. DOI : https://doi.nrct.go.th/ListDoi/listDetail?Resolve_DOI=10.14457/KMUTT.the.2011.213