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)