"Oblique projections and frames" (2006) Antezana, J.; Corach, G.; Ruiz, M.; Stojanoff, D. Proceedings of the American Mathematical Society. 134(4):1031-1037
"Projections in operator ranges" (2006) Corach, G.; Maestripieri, A.; Stojanoff, D. Proceedings of the American Mathematical Society. 134(3):765-778
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