Characterization of organic matter in bottom sediments of Ivashkina Lagoon, Laptev Sea Elena Gershelis, Ivan Goncharov, Oleg Dudarev, Alexey Ruban and Igor Semiletov E3S Web Conf., 98 (2019) 06006 Published online: 07 June 2019 DOI: 10.1051/e3sconf/20199806006