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Embry, Mary R.: A generalization of the Halmos-Bram criterion for subnormality. Acta scientiarum mathematicarum, (35). pp. 61-64. (1973)
Embry, Mary R.: A connection between commutativity and separation of spectra of operators. Acta scientiarum mathematicarum, (32) 3-4. pp. 235-237. (1971)