Affordance Relations. - Ivo Düntsch; Günther Gediga; Adam Lenarcic (RSFDGrC, 2009)

Optimal Approximations with Rough Sets. - Ryszard Janicki; Adam Lenarcic (RSKT, 2013)

Optimal approximations with Rough Sets and similarities in measure spaces. - Ryszard Janicki; Adam Lenarcic (Int. J. Approx. Reason., 2016)