M. R. Vaziri and A. L. Arab, “Morphological Variations, Patterns of Frontal Ambulacrum Pores and Paleoecology of Heteraster renngarteni Poretzkaja (Echinoidea: Spatangoida) from Aptian Sediments of Baghin Area, Kerman, Iran: Morphology of Heteraster renngarteni from Iran”, Pakistan Journal of Scientific & Industrial Research, vol. 54, no. 1, pp. 41–46, Apr. 2011.