1. School of Mathematical and Computer Sciences, Heriot-Watt University Malaysia, Putrajaya 62200, Malaysia (Corresponding author), e-mail: weilin.teoh@gmail.com, https://orcid.org/0000-0003-4715-1490
2. Department of Physical and Mathematical Science, Universiti Tunku Abdul Rahman, Kampar, Perak 31900, Malaysia
3. School of Mathematical Sciences, Universiti Sains Malaysia, Penang 11800, Malaysia, https://orcid.org/0000-0002-3245-1127
4. Department of Operations and Management Information Systems, Universiti Malaya, Kuala Lumpur 50603, Malaysia