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Ralf Wastl
University of W├╝rzburg, Germany

R. Wastl:
Linear Derivations for Keys of a Database Relation Schema
/jucs_4_12/linear_derivations_for_keys
page 883 - 897
Vol.4 / Issue 12
R. Wastl:
On the Number of Keys of a Relational Database Schema
/jucs_4_5/on_the_number_of
page 547 - 559
Vol.4 / Issue 5