Formal Description of Rough Sets. - Edward Bryniarski (RSKD, 1993)

Formal Conception of Rough Sets. - Edward Bryniarski (Fundam. Informaticae, 1996)

Extensions and Intentions in the Ruogh Set Theory. - Zbigniew Bonikowski; Edward Bryniarski; Urszula Wybraniec-Skardowska (Inf. Sci., 1998)

Calculus of Contextual Rough Sets in Contextual Spaces. - Edward Bryniarski; Urszula Wybraniec-Skardowska (J. Appl. Non Class. Logics, 1998)

Rough Pragmatic Description Logic. - Zbigniew Bonikowski; Edward Bryniarski; Urszula Wybraniec-Skardowska (Rough Sets and Intelligent Systems (2), 2013)