A course in universal algebra S Burris, HP Sankappanavar Graduate Texts Math 78, 56, 1981 | 4880* | 1981 |

Semi-de Morgan algebras HP Sankappanavar The Journal of symbolic logic 52 (3), 712-724, 1987 | 88 | 1987 |

Semi-Heyting algebras: an abstraction from Heyting algebras HP Sankappanavar Actas del IX Congreso Dr. A. Monteiro, 33-66, 2007 | 69 | 2007 |

A characterization of principal congruences of De Morgan algebras and its applications HP Sankappanavar Studies in Logic and the Foundations of Mathematics 99, 341-349, 1980 | 63 | 1980 |

Heyting Algebras with a Dual Lattice Endomorphism. HP Sankappanavar Mathematical Logic Quarterly 33 (6), 1987 | 54 | 1987 |

Heyting algebras with dual pseudocomplementation. HP Sankappanavar | 47 | 1985 |

Pseudocomplemented Ockham and de Morgan algebras HP Sankappanavar Zeitschrift für mathematische Logik und Grundlagen der Mathematik 32, 385-396, 1986 | 43 | 1986 |

A course in universal algebra B Stanley, HP Sankappanavar Graduate Texts in Mathematics 78, 1981 | 36 | 1981 |

Principal congruences of pseudocomplemented Demorgan algebras HP Sankappanavar Zeitschrift f r Mathematische Logik und Grundlagen der Mathematik 33 (1), 3-11, 1987 | 35 | 1987 |

Demi-pseudocomplemented lattices: principal congruences and subdirect irreducibility HP Sankappanavar Algebra Universalis 27, 180-193, 1990 | 31 | 1990 |

Expansions of semi-Heyting algebras I: Discriminator varieties HP Sankappanavar Studia Logica 98, 27-81, 2011 | 29 | 2011 |

Distributive Lattices with a Dual Endomorphism. HP Sankappanavar Mathematical Logic Quarterly 31, 1985 | 26 | 1985 |

Lattice-theoretic decision problems in universal algebra S Burris, HP Sankappanavar Algebra Universalis 5 (1), 163-177, 1975 | 26 | 1975 |

Quasi‐Stone algebras NH Sankappanavar, HP Sankappanavar Mathematical Logic Quarterly 39 (1), 255-268, 1993 | 19 | 1993 |

Decision problems: history and methods HP Sankappanavar Mathematical logic: Proceedings of the First Brazilian Conference, Marcel …, 1978 | 16 | 1978 |

A course in universal algebra: The millennium edition, 2000 S Burris, HP Sankappanavar | 16 | |

A course in universal algebra. 1981 S Burris, HP Sankappanavar Graduate texts in mathematics, 1981 | 15 | 1981 |

De Morgan Algebras: New Perspectives and Applications HP Sankappanavar Scientiae Mathematicae Japonicae 75 (1), 139-168, 2012 | 14 | 2012 |

Congruence lattices of pseudocomplemented semilattices HP Sankappanavar Algebra Universalis, 1979 | 13 | 1979 |

Semisimple varieties of implication zroupoids JM Cornejo, HP Sankappanavar Soft Computing 20 (8), 3139-3151, 2016 | 12 | 2016 |