Machalski , Marcin. “Scaphitid Ammonites from the Lower Maastrichtian of Nahoryany (western Ukraine) and Discussion on the Origin of Hoploscaphites Constrictus”. Netherlands Journal of Geosciences 103 (March 22, 2024). Accessed April 3, 2026. https://njgjournal.nl/index.php/njg/article/view/11074.