International Society of Difference Equations (http://isdeds.com/)
Journal of Difference Equations and Applications (https://www.tandfonline.com/toc/gdea20/current)
ICDEA (http://isdeds.com/icdea.html)
American Mathematical Society (https://www.ams.org/home/page)
European Mathematical Society (http://euro-math-soc.eu/)
Academy of Romanian Scientists
Romanian Mathematical Society