Balashov , Y. 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, vol. 12, no. 2, Jan. 1993, pp. 147-52, doi:10.3402/polar.v12i2.6710.