Injective hulls are not natural Jiří AdámekHorst HerrlichWalter Tholen Regular article Pages: 379 - 388
A coalgebraic approach to quasigroup permutation representations Jonathan D. H. Smith Regular article Pages: 427 - 438
A survey of recent results on congruence lattices of lattices Jiří TumaFriedrich Wehrung Regular article Pages: 439 - 471
Flat and weakly flat projection algebras M. Mehdi EbrahimiM. Mahmoudi Regular article Pages: 479 - 484