Kreek, K., Kulp, K., Uibu, M., Mere, A., Koel, M. Preparation of metal-doped carbon aerogels from oil shale processing by-products // Oil shale (2014) Vol. 31, 2, p. 185-194 : ill. https://artiklid.elnet.ee/record=b2673721*est https://doi.org/10.3176/oil.2014.2.08