1. Institute of Computer Science University of Silesia Sosnowiec Poland
2. Department of Mathematics City University of Hong Kong Kowloon Hong Kong
3. Nicolas Tessellation Quincy‐sous‐Sénart France
4. Bailey Tessellation Grimsby, North East Lincolnshire UK
5. School of Science Guangxi University of Science and Technology Liuzhou P.R. China
6. School of Mathematics and Physics Jinggangshan University Ji'an P.R. China