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We examine certain extensions of the standard model in which $CP$ violationis spontaneous and the strong $CP$ problem is resolved. In these models, the $3\times 3$ quark mixing matrix is neither real nor unitary. However, to aprecision of 0.1%, it is real and orthogonal. There are no readily observable$CP$-violating effects besides those in the neutral kaon system.Comment: 6 pages, latex, no figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Cabibbo mixing and the search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>CP</mml:mi></mml:math>violation in the aspon model

Cabibbo mixing and the search forCPviolation in the aspon model