Whymark, A. (2013). Review Of The Australasian Tektite Source Crater Location And Candidate Structure In The Song Hong-Yinggehai Basin, Gulf Of Tonkin // 44th Lunar and Planetary Science Conference.
Monika Kumlehn de Mamani & Ingrid Grambow IMPAKTNAMEN: Namen der [Meteorite; Impakte/Krater; Boliden/Fireballs; Tektite] im Sonnensystem.(2014)

Left: Shale diapir-like structures (shaded) in the Gulf of Tonkin after. Dashed lines equal sediment isopachs (km). Right: A 43 (+-3) km diameter circular feature noted on GETECH free-air gravity in the bottom-left quadrant (Whymark A., 2013).