Manoylov, K. M., N. Ognjanova-Rumenova, and R. J. Stevenson. “Morphotype Variations in Subfossil Diatom Species of Aulacoseira in 24 Michigan Lakes, USA”. Acta Botanica Croatica, vol. 68, no. 2, Oct. 2009, https://www.abc.botanic.hr/index.php/abc/article/view/116.