saiful izzuan hussain, r. nur-firyal, nadiah ruza.  (2022).  linkage transitions between oil and the stock markets of countries with the highest covid-19 cases.  - journal of commodity markets.  1-17. 

gongxing yan, ali shawabkeh, rishabh chaturvedi, r. nur-firyal, mohammad mehdizadeh youshanlouei.  (2022).  using mhd free convection to receive the generated heat by an elliptical porous media.  - case studies in thermal engneering.  1-15. 

nur sabrina razali, r. nur-firyal.  (2021).  predicting index price based on the covid-19 cases and deaths.  - sains malaysiana.  2829-2842.