A. M. Awwad, K. A. Jaffer, and A. H. Sulymon, “Liquid-Liquid Equilibria of N-Methylpyrrolidone and Hydrocarbon”, IJCPE, vol. 2, no. 4, pp. 48–50, Dec. 2001, doi: 10.31699/IJCPE.2001.4.8.