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Uniqueness condition for the Pick problem. Cedeño, Gladys, Cotlar, Mischa (2000) Divulgaciones Matemáticas
Uniqueness of Hahn-Banach extensions and liftings of linear dependences. Asvald Lima (1983) Mathematica Scandinavica
Uniqueness of Hahn-Banach Extensions from Certain Spaces of Analytic Functions. Edgar Reich (1979) Mathematische Zeitschrift
Uniqueness of invariant Hahn-Banach extensions. P. Bandyopadhyay, A. K. Roy (2007) Extracta Mathematicae