Volume & Issue: Volume 11, Special Issue Dedicated to Prof. George A. Grätzer, Summer and Autumn 2019, Pages 1-222 
5. On semi weak factorization structures

Pages 33-56

Azadeh Ilaghi-Hosseini; Seyed Shahin Mousavi Mirkalai; Naser Hosseini


8. Another proof of Banaschewski's surjection theorem

Pages 113-130

Dharmanand Baboolal; Jorge Picado; Ales Pultr


9. Intersection graphs associated with semigroup acts

Pages 131-148

Abdolhossein Delfan; Hamid Rasouli; Abolfazl Tehranian


11. (r,t)-injectivity in the category $S$-Act

Pages 169-196

Mahdieh Haddadi; Seyed Mojtaba Naser Sheykholislami