- Comparative thermochemical conversion processing of biomass and fossil fuel [Electronic resource]Luik, Hans; Luik, Lea; Veski, Rein14th European Biomass Conference : proceedings2006 / p. 727-730 [CD-ROM]
- Conversion of willow biomass at varied thermochemical conditions [Electronic resource]Luik, Hans; Luik, Lea; Tamvelius, Hindrek14th European Biomass Conference : proceedings2006 / p. 940-942 [CD-ROM]
- Thermochemical liquefaction of reed [Electronic resource]Veski, Rein; Palu, Vilja; Luik, Hans; Kruusement, Kristjan14th European Biomass Conference : proceedings2006 / p. 947-949 [CD-ROM] https://go.gale.com/ps/i.do?id=GALE%7CA198705954&sid=googleScholar&v=2.1&it=r&linkaccess=abs&issn=14060124&p=AONE&sw=w&userGroupName=anon%7Eec7ac821&aty=open-web-entry