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Sain, D and Mal, A and Paul, K (2020) Some remarks on Birkhoff–James orthogonality of linear operators. In: Expositiones Mathematicae, 38 (1). pp. 138-147.
Gadgil, Siddhartha (2010) Open manifolds, Ozsvath-Szabo invariants and exotic R-4 ` S. In: Expositiones Mathematicae, 28 (3). pp. 254-261.
Gadgil, Siddhartha (2008) Incompressibility and least-area surfaces. In: Expositiones Mathematicae, 26 (1). pp. 93-98.