Heiri, Oliver, Jos Schilder, and Maarten van Hardenbroek. “Stable Isotopic Analysis of Fossil Chironomids As an Approach to Environmental Reconstruction: State of Development and Future Challenges”. Fauna norvegica 310 (October 17, 2012): 7. Accessed March 29, 2024. https://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/1436.