Low-temperature and Low-pressure HydroThermal Liquefaction (L-HTL) of biomass using ultrasonic cavitation to achieve a local supercritical state in waterJüri Liiv, Uno Mäeorg, Neeme Vaino and Ergo RikmannSci. Tech. Energ. Transition, 79 (2024) 3DOI: https://doi.org/10.2516/stet/2023043