I am flattered to find that my first article here (Enforcing Complex Constraints in Oracle) is credited in the Acknowledgements of this interesting article by Vadim Tropashko on DBAZine:
http://www.dbazine.com/tropashko8.shtml
As well as approaching the subject from first principles, the article also suggest further applications of such constraints, e.g. "foreign keys" to more than one parent table, and enforcing uniqueness of column values across more than one table.
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