Hilioti Z, Michailof CM, Valasiadis D, Iliopoulou EF, Koidou V, Lappas AA: Characterization of castor plant-derived biochars and their effects as soil amendments on seedlings. Biomass and Bioenergy (105) 2017: 96-106. doi: http://dx.doi.org/10.1016/j.biombioe.2017.06.022