Cao ST, Nguyen LA. Incorporating Stratified Negation into Query-Subquery Nets for Evaluating Queries to Stratified Deductive Databases. Comput. Inform. [Internet]. 2019 Apr. 26 [cited 2024 Nov. 23];38(1):19–56. Available from: http://147.213.75.17/ojs/index.php/cai/article/view/2019_1_19