Bielak, K., Dudzińska, M. and Pretzsch, H. 2014. Mixed stands of Scots pine (Pinus sylvestris L.) and Norway spruce [Picea abies (L.) Karst] can be more productive than monocultures. Evidence from over 100 years of observation of long-term experiments. Forest Systems. 23, 3 (Dec. 2014), 573-589. DOI:https://doi.org/10.5424/fs/2014233-06195.