Source: https://www.researchgate.net/profile/Naseer-Shukur/publication/345931749_Dissertation_Paper_-_Naseer_Shukur_MALLE_2nd_year_June_2017/links/5fb243ee45851518fda9d266/Dissertation-Paper-Naseer-Shukur-MALLE-2nd-year-June-2017.pdf