[1] Chajda I.: 
A localization of some congruence conditions in varieties with nullary operations. Ann. Univ. Sci. Budapest., Math. 30 (1987), 17-23. 
MR 0927804 | 
Zbl 0636.08004[2] Chajda I.: 
A characterization of congruence kernels in pseudocomplemented semilattices. (Preprint). 
MR 1967337 | 
Zbl 1042.06002[3] Chajda I., Halaš R.: 
Finite basis of ideal terms in ideal determined varieties. Algebra Universalis 37 (1997), 243-252. 
MR 1441389 | 
Zbl 0902.08004[4] Chajda I., Zedník J.: 
Determined congruence classes in Brouwerian semilattices. East-West J. Math, (to appear). 
MR 1770809 | 
Zbl 0964.08004[5] Fichtner, K: 
Eine Bemerkung über Mannigfaltigkeiten universeller Algebren mit Idealen. Monatsh. Dt. Akad. Wiss. (Berlin) 12 (1970), 21-45. 
MR 0256968 | 
Zbl 0198.33601[6] Gumm H. P., Ursini A.: 
Ideals in universal algebras. Algebra Universalis 19 (1984), 45-54. 
MR 0748908 | 
Zbl 0547.08001[7] Köhler P.: 
Brouwerian semilattices, the lattice of total subalgebras. Universal Algebra Appl. 8 (1982), Banach Centre Publ., 47-56. 
MR 0738800 | 
Zbl 0514.06009