Funding for this research was provided by:
European Union’s Horizon 2020 Research and Innovation Programme under the Marie Sk lodowska-Curie grant agreement (823731 - CONMECH)
National Science Center of Poland under Preludium Project (2017/25/N/ST1/00611)
NSF of Guangxi Grant (2017GXNSFBA198152, 2017GXNSFBA198031)
Projects of Young Teachers Scientific Research Development Foundation of Guangxi University of Finance and Economics (2017QNA03)
Article History
Received: 20 August 2019
Revised: 16 January 2020
First Online: 29 January 2020