I. Romakkaniemi, J. Ahola, J. Panula-Perälä, M. Mikola, J. Pyörälä, and J. Tanskanen, “Solvent Fractionation of Technical Lignin Materials with Industrially Relevant Solvents”, Period. Polytech. Chem. Eng., vol. 68, no. 2, pp. 181–194, Jan. 2024.