Vega Carmen P., Björkman Mats P., Pohjola Veijo A., Isaksson Elisabeth, Pettersson Rickard, Martma Tõnu, Marca Alina, and Kaiser Jan. 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.