Bech, Niels; Jensen, Peter Arendt; Dam-Johansen, Kim (2009). "Determining the elemental composition of fuels by bomb calorimetry and the inverse correlation of HHV with elemental composition". Biomass & Bioenergy, 33(3), 534-537. 33 (3): 534. Bibcode:2009BmBe...33..534B. doi:10.1016/j.biombioe.2008.08.015.
Bech, Niels; Jensen, Peter Arendt; Dam-Johansen, Kim (2009). "Determining the elemental composition of fuels by bomb calorimetry and the inverse correlation of HHV with elemental composition". Biomass & Bioenergy, 33(3), 534-537. 33 (3): 534. Bibcode:2009BmBe...33..534B. doi:10.1016/j.biombioe.2008.08.015.