Free amino acids in the Arctic snow and ice core samples : potential markers for paleoclimatic studiesBarbaro, Elena; Spolaor, Andrea; Karroca, Ornela; Park, Ki-Tae; Martma, TõnuScience of the total environment2017 / p. 454-462 : ill https://doi.org/10.1016/j.scitotenv.2017.07.041