Classifying the ice seasons 1982-2016 using the weighted ice days number as a new winter severity characteristicRjazin, Jevgeni; Alari, Victor; Pärn, OveEUREKA : physics and engineering2017 / p. 49-56 : ill http://dx.doi.org/10.21303/2461-4262.2017.00364 EU Phare Twinning project "Strengthening enforcement of maritime safety"Heering, DanMaritime security and MET2005 / p. 97-106 https://www.witpress.com/books/978-1-84564-058-3