Mohl, K. D., Kienle, A., Gilles, E. D., Rapmund, P., Sundmacher, K., & Hoffmann, U. (1999). Steady state multiplicities in reactive distillation columns for the production of fuel ethers MTBE and TAME: theoretical analysis and experimental verification. Chemical Engineering Science, 54(8), 1029-1043. doi:10.1016/S0009-2509(98)00327-3.