Vinn, Olev, et al. “The First Record of Endobiotic Cornulitids in a Heliolitid Coral from the Hirnantian (Late Ordovician) of Estonia”. Revista Brasileira De Paleontologia, vol. 28, no. 4, Feb. 2026, p. e20250548, doi:10.4072/rbp.2025.4.0548.