Barthélémy, R.M., J.P. Casanova, M. Grino, and E. Faure. 2007. “Selective Expression of Two Types of 28S RRNA Paralogous Genes in the Chaetognath Spadella Cephaloptera”. Cellular and Molecular Biology 53 (6):989-93. https://mail.cellmolbiol.org/index.php/CMB/article/view/1871.