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Sustainable utilisation of forest biomass for energy-possibilities and problems: Policy, legislation, certification, and recommendations and guidelines in the Nordic, Baltic, and other European countries Stupak I, Asikainen A, Jonsell M, Karltun E, Lunnan A, Mizaraite D, Pasanen K, Parn H, Raulund-Rasmussen K, Roser D, Schroeder M, Varnagiryte I, Vilkriste L, Callesen I, Clarke N, Gaitnieks T, Ingerslev M, Mandre M, Ozolincius R, Saarsalmi A, Armolaitis K, Helmisaari HS, Indriksons A, Kairiukstis L, Katzensteiner K, Kukkola A, Ots K, Ravn HP, Tamminen P |