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Extreme extensions of positive operators Lipecki, Z. (1978) Abstracta. 6th Winter School on Abstract Analysis
Extreme points in spaces of operators and vector – valued measures Werner, Dirk (1984) Proceedings of the 12th Winter School on Abstract Analysis
Extreme points of numerical ranges of quasihyponormal operators Jaime Rodríguez Montes (1993) Revista colombiana de matematicas
Extremely Non-Nice Operators into CK and Continuous Mappings into the Hilbert Cube. S. Koppelberg, P. Greim (1984/1985) Mathematische Zeitschrift