Volume XXXI, Issue 1, 2021 Qualifications of Instruction Sequence Failures, Faults and Defects: Dormant, Effective, Detected, Temporary, and Permanent, pages 1-50 Authors: J.A. Bergstra Abstract | References | BibTeX | Full Text (PDF) A Note on Congruences of Infinite Bounded Involution Lattices, pages 51-78 Authors: C. Mureșan Abstract | References | BibTeX | Full Text (PDF) Small Longest Tandem Scattered Subsequences, pages 79–110 Authors: L.M.S. Russo, A.P. Francisco Abstract | References | BibTeX | Full Text (PDF) Applying MDE to ROS Systems: A Comparative Analysis, pages 111-144 Authors: M.Trezzy, I. Ober, I. Ober, R. Oliveira Abstract | References | BibTeX | Full Text (PDF)