See L. Jenyns' Observations in Nat. Hist. London, 1846, p. 296.
"A Revision of the Lysiopetalidae, a family of the Chilognath Myriapoda, with a notice of the genus Cambala," by A. S. Packard, junior, Proc. Amer. Phil. Soc. xxi. 1884, p. 187.
C. L. Koch, System der Myriapoden. Regensburg, 1847.
C. L. Koch, Die Myriapoden. Halle, 1863.
Latzel, Die Myriapoden der Œsterreichisch-Ungarischen Monarchie. Wien, 1880.