dL-Filters of principal MS-algebras

In this paper the notion of dLdL-filters is introduced and characterized in principal MS  -algebras. Also many properties of principal dLdL-filters of a principal MS  -algebra are observed and a characterization of the class of all principal dLdL-filters is given. Finally, a relationship between dLdL-filters and congruences on a principal MS-algebra is investigated.