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Schmidt, Jürgen, Characterizations of Filtered Products of Relational Systems |

Schmidt, Jürgen, Quasi-Decompositions, Exact Sequences, and Triple Sums of Semigroups. I. General Theory |

Schmidt, Jürgen, Quasi-Decompositions, Exact Sequences, and Triple Sums of Semigroups. II. Applications |

Schmidt, Jürgen, Remark on the Axiom of Infinity |

Schmidt, Jürgen, Universal and Internal Properties of Some Completions of k-Join-Semilattices and k-Join-Distributive Partially Ordered Sets |

Schmidt, Jürgen, Universal and Internal Properties of Some Extensions of Partially Ordered Sets |

Schmidt, Jürgen ; Tsinakis, Constantine, Relative Pseudo-Complements, Join-Extensions, and Meet-Retractions |

Schönfeld, Wolfgang, Ehrenfeucht-Fraissé-Spiel, disjunktive Normalformen und Endlichkeitssatz (1974) |

Schönfeld, Wolfgang, An Undecidability Result for Relation Algebras |

Schönfeld, Wolfgang, Gleichungen in der Algebra der binären Relationen |