A very similar Yaozhou celadon bowl and cover is illustrated by R. Krahl, Chinese Ceramics from the Meiyintang Collection, vol. 3 (II), London, 2006, p. 483, no. 1486. Fragmentary covered bowls of this type have been recovered from the Yaozhou kiln sites at Huangpu near Tongchuan in Shaanxi province. See Songdai Yaozhou yaozhi, Beijing, 1998, col. pl. 2, fig. 2, and pl. 29, fig. 6.