1. Bella IE, Yang RC (1991) Should we thin young aspen stands? In: Navratil S, Chapman PB (eds) Aspen management for the 21st century. Proceedings of a symposium Nov. 20–21, 1990. Forestry Canada, Northwest Region/Poplar Council of Canada, Joint Publication, Edmonton, Alberta, pp 135–139
2. Binkley CS (1987) When is the optimal economic rotation longer than the rotation of maximum sustained yield? J Environ Econ Manag 14(2):152–158
3. Einspahr DW (1984) Production and utilization of triploid hybrid aspen. Iowa State J Res 58:401–409
4. IEA (2013) Nordic energy technology perspectives: pathways to a carbon neutral energy future. International Energy Agency and Nordic Energy Research, IEA Publications, Paris
5. Johansson T (2013a) Biomass production of hybrid aspen growing on former farm land in Sweden. J For Res 24(2):237–246