● Kämpfer P,Witzenberger R,Denner EB,Busse HJ,Neef A (2002). Novosphingobium hassiacum sp. nov., a new species isolated from an aerated sewage pond. Syst. Appl. Microbiol.25, 37-45. ● Yabuuchi E,Kosako Y,Fujiwara N,Naka T,Matsunaga I,Ogura H,Kobayashi K (2002). Emendation of the genus Sphingomonas Yabuuchi et al. 1990 and junior objective synonymy of the species of three genera, Sphingobium, Novosphingobium and Sphingopyxis, in conjunction with Blastomonas ursincola. Int. J. Syst. Evol. Microbiol.52, 1485-96.