- Possible energy sector trends in Estonia : context of climate changeKask, Ilmar; Esop, Markko-Raul; Pallo, Toomas; Liik, Olev; Raesaar, Peeter; Selg, Vello; Valma, Arno; Kask, Ülo; Purju, Alari; Kallaste, Tiit1999 https://www.ester.ee/record=b1275146*est