Fundamentals of SIGLA, an interval computing system over the completed set of intervals. - Ernest Gardeñes; Albert Trepat (Computing, 1980)

Modal Intervals: Reason and Ground Semantics. - Ernest Gardeñes; Honorino Mielgo; Albert Trepat (Interval Mathematics, 1985)

Model Intervals. - Ernest Gardeñes; Miguel Ángel Sainz; Lambert Jorba; Remei Calm; Rosa Estela; Honorino Mielgo; Albert Trepat (Reliab. Comput., 2001)

Formal Solution to Systems of Interval Linear or Non-Linear Equations. - Miguel Ángel Sainz; Ernest Gardeñes; Lambert Jorba (Reliab. Comput., 2002)

Interval Estimations of Solution Sets to Real-Valued Systems of Linear or Non-Linear Equations. - Miguel Ángel Sainz; Ernest Gardeñes; Lambert Jorba (Reliab. Comput., 2002)