Vega , Carmen P., Mats P. Björkman, Veijo A. Pohjola, Elisabeth Isaksson, Rickard Pettersson, Tõnu Martma, Alina Marca, and Jan Kaiser. 2015. “Nitrate Stable Isotopes in Snow and Ice Samples from Four Svalbard Sites”. Polar Research 34 (April). https://doi.org/10.3402/polar.v34.23246.