@misc{boin_a_numerical_1994, 
author={Boin, M.,Levkov, L.},
title={A numerical study of contrail development},
year={1994},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Boin, M.; Levkov, L.: A numerical study of contrail development. Annales Geophysicae. 1994. vol. 12, 969-978.}}