N. M.  Litvinova, ?The life forms of Ophiuroidea (based on the morphological structures of their arms)?, in Echinoderms Through Time. Proceedings of the Eigth International Echinoderm Conference, Dijon, France, B.  David, Guille, A., Féral, J. - P., and Roux, M., Eds. Rotterdam: Balkema, 1994, pp. 443?454.