BALASHOV , Y. A.; LARIONOV , A. N.; GANNIBAL , L. F.; SIROTKIN , A. N.; TEBENKOV , A. M.; RYÜNGENEN , G. I.; OHTA , Y. An Early Proterozoic U-Pb zircon age from an Eskolabreen Formation gneiss in southern Ny Friesland, Spitsbergen. Polar Research, v. 12, n. 2, p. 147-152, 12 Jan. 1993.