Chen et al., 2004 (review and key Chinese species); Cloarec, 1986; Kanyukova, 1989 (tax.); Lansbury, 1972b (tax.), 1974b (tax.); Larsén, 1936, 1949 (biol.); Lee, 1991 (morph., tax.); Marshall & Severin, 1904 (morph.); Nieswander, 1925 (morph.); Radinovsky, 1964; Runck & Blinn, 1990, 1992.