It should be noted that this density is reflected in the later figures presented for the Bac Bo
region in the well-known work of Hans Bielenstein (1947) on the Han census of 2 CE, a work which does not appear in Nam Kim's bibliography but one whose findings correlate well with his own.
The incident, in fact, can be added to a consistent pattern of Chinese expansionism in the Eastern Sea: conquest of the Paracel Islands in 1974; occupation of the Spratly archipelagoes in 1979; and annexation of 12,000 square meters of territorial waters in the Vinh Bac Bo
conceded by Hanoi under the 2000 Vinh Bac Bo
For discussion of this issue, see Diep Dinh Hoa, Nguoi Viet o dong bang Bac Bo
(Hanoi: Nha xuat ban [NXB] Khoa hoc xa hoi 2000), pp.