Krammer, K. and H. Lange-Bertalot. 1991. Süßwasserflora von Mitteleuropa. Band 2 (Bacillariophyceae) Teil 4 (Achnanthaceae, Kritische Ergänzungen zu Navicula [Lineolate] und Gomphonema Gesamtliteraturverzeichnis Teil 1-4). Gustav Fischer Verlag. Stuttg
Unsorted bulk microalgae sample collected as part of the NEON periphyton, seston, and phytoplankton collection protocols conducted three times annually. Archived in either 2% high-iodine Lugol's solution or 0.5% glutaraldehyde.