Ok, Yŏng-sik (Ed.) (2015): Biochar. Production, characterization, and applications
Ok, Yŏng-sik (Ed.) (2015): Biochar. Production, characterization, and applications. Boca Raton: CRC Press (Urbanization, industrialization, and the environment).
„Encompassing high priority research areas such as bioenergy production, global warming mitigation, and sustainable agriculture, biochar has received increased worldwide interest in the past decade.“