1. Akkasaeng, R., 1993. Relationship of nitrogen fertility to photosynthetic efficiency and morphology of Panicum virgatum L. Unpublished PhD thesis. North Carolina State University, North Carolina, USA, 90 pp.
2. Establishment success of switchgrass in an intercropped forestry system on the Lower Coastal Plain of North Carolina, U.S.A;Albaugh;Biomass Bioenerg.,2012
3. Distribution, production, and diversity of C3- and C4-dominated communities in a mixed prairie;Barnes;Can. J. Botany,1983
4. Beauvais, C., 2010. Coarse woody debris in a loblolly pine plantation managed for biofuel production. Unpublished MSc thesis. Duke University, North Carolina, USA, 62 pp.
5. Responses to different quantum flux densities;Björkman,1981