Balashov , Yu. A., A. N. Larionov, L. F. Gannibal, A. N. Sirotkin, A. M. Tebenkov, G. I. Ryüngenen, and Y. Ohta. 1993. “An Early Proterozoic U-Pb Zircon Age from an Eskolabreen Formation Gneiss in Southern Ny Friesland, Spitsbergen”. Polar Research 12 (2):147-52. https://doi.org/10.3402/polar.v12i2.6710.