Roy, S., Das, A. K., & Banerjee, R. (2014). Application of Grey–Taguchi based multi-objective optimization strategy to calibrate the PM–NHC–BSFC trade-off characteristics of a CRDI assisted CNG dual-fuel engine. Journal of Natural Gas Science and Engineering, 21, https://doi.org/10.1016/j.jngse.2014.09.022