Dear Colleagues As we mentioned before, this is to announce that: In honor of Professor George A. Gratzer, we are going to celebrate (i) 55th anniversary of the publication of Gratzer–Schmidt Theorem, and (ii) 40the anniversary of Gratzer’s General Lattice Theory book, and many other his contributions to Universal Algebra and Lattice Theory, by dedicating a volume of our journal CGASA (Categories and General Algebraic Structures with Applications: www.cgasa.ir) to him. We invite all of you to join this events by submitting your papers. The deadline to submit papers is September 30, 2018. Best Regards, Mojgan Mahmoudi and M. Mehdi Ebrahimi On behalf of the Editorial Board ************************* Mojgan Mahmoudi; Professor Department of Mathematics, Shahid Beheshti University, Tehran 19839, IRAN. Telefax: (+98)(21)(22431652) E-mail: m-mahmoudi@sbu.ac.ir, mojganmahmoudi@yahoo.com http://faculties.sbu.ac.ir/m-mahmoudi/ [For admin and other information see: http://www.mta.ca/~cat-dist/ ]