Balashov , Yu. A., A. N. Larionov, L. F. Gannibal, A. N. Sirotkin, A. M. Tebenkov, G. I. Ryüngenen, and Y. Ohta. “An Early Proterozoic U-Pb Zircon Age from an Eskolabreen Formation Gneiss in Southern Ny Friesland, Spitsbergen”. Polar Research 12, no. 2 (January 12, 1993): 147-152. Accessed March 28, 2026. https://polarresearch.net/index.php/polar/article/view/1995.