Nai-juan DENG, Dan-yao WU, Ping-zhi YUAN
Quasi-idempotent ranks of some permutation groups and transformation semigroups
Arzu AKGÜL, Fethiye Müge SAKAR
On Walker 4-manifolds with pseudo bi-Hermitian structures
Pinar ONGAN, Burcu Gülmez TEMÜR
Zahide Ok BAYRAKDAR, Tuna BAYRAKDAR
Hesam MAHZOON, Rahim KARGAR, Janusz SOKOL
Po-groups and hypergroups in a topos