Joabsson A., Røjle Christensen T., and Wallén B. “Influence of Vascular Plant Photosynthetic Rate on CH4 Emission from Peat Monoliths from Southern Boreal Sweden”. Polar Research, vol. 18, no. 2, Jan. 1999, pp. 215-20, doi:10.3402/polar.v18i2.6577.