| Ideals in universal algebras HP Gumm, A Ursini Technische Hochschule, Fachbereich Mathematik, 1982 | 228 | 1982 |
| On subtractive varieties, I A Ursini Algebra Universalis 31, 204-222, 1994 | 151 | 1994 |
| Sulle varieta’di algebre con una buona teoria degli ideali A Ursini BOLLETTINO DELLA UNIONE MATEMATICA ITALIANA 4 (6), 90-95, 1972 | 90 | 1972 |
| Ideals and other generalizations of congruence classes P Agliano, A Ursini Journal of the Australian Mathematical Society 53 (1), 103-115, 1992 | 56 | 1992 |
| On subtractive varieties III: From ideals to congruences P Agliano, A Ursini Algebra Universalis 37, 296-333, 1997 | 54 | 1997 |
| Osservazioni sulla varietá BIT A Ursini Bolletino della Unione Matematica Italiana 8, 205-211, 1973 | 51 | 1973 |
| On subtractive varieties II: General properties P Agliano, A Ursini Algebra Universalis 36, 222-259, 1996 | 50 | 1996 |
| Ideal determined categories G Janelidze, L Márki, W Tholen, A Ursini Cahiers de topologie et geométrie différentielle catégoriques 51 (2), 115-125, 2010 | 43 | 2010 |
| Ideals and clots in universal algebra and in semi-abelian categories G Janelidze, L Márki, A Ursini Journal of Algebra 307 (1), 191-208, 2007 | 41 | 2007 |
| On subtractive varieties IV: Definability of principal ideals P Agliano, A Ursini Algebra Universalis 38, 355-389, 1997 | 28 | 1997 |
| Prime ideals in universal algebras A Ursini Acta Universitatis Carolinae. Mathematica et Physica 25 (1), 75-87, 1984 | 25 | 1984 |
| On subtractive varieties, V: congruence modularity and the commutators A Ursini algebra universalis 43, 51-78, 2000 | 23 | 2000 |
| A good theory of ideals in regular multi-pointed categories M Gran, Z Janelidze, A Ursini Journal of Pure and Applied Algebra 216 (8-9), 1905-1919, 2012 | 22 | 2012 |
| Ideals and clots in pointed regular categories G Janelidze, L Márki, A Ursini Applied Categorical Structures 17 (4), 345-350, 2009 | 20 | 2009 |
| Weighted commutators in semi-abelian categories M Gran, G Janelidze, A Ursini Journal of Algebra 397, 643-665, 2014 | 18 | 2014 |
| A modal calculus analogous to K4W, based on intuitionistic propositional logic, Iℴ A Ursini Studia Logica 38, 297-311, 1979 | 16 | 1979 |
| Split short five lemma for clots and subtractive categories Z Janelidze, A Ursini Applied Categorical Structures 19, 233-255, 2011 | 12 | 2011 |
| Intuitionistic diagonalizable algebras A Ursini algebra universalis 9, 229-237, 1979 | 12 | 1979 |
| Symmetry of regular diamonds, the Goursat property, and subtractivity M Gran, Z Janelidze, A Ursini, D Rodelo | 11 | 2012 |
| Logic and algebra A Ursini Routledge, 2017 | 10 | 2017 |
