A Four-Valued Modal Logic Arising from Monteiro's Last Algebras. - Josep Maria Font; Miquel Rius (ISMVL, 1990)

An Abstract Algebraic Logic Approach to Tetravalent Modal Logics. - Josep Maria Font; Miquel Rius (J. Symb. Log., 2000)

The vertex isoperimetric problem for the powers of the diamond graph. - Sergei L. Bezrukov; Miquel Rius; Oriol Serra (Discret. Math., 2008)