Subspace gaps and Weyl's theorem for an elementary operator. - Bhagwati Prashad Duggal (Int. J. Math. Math. Sci., 2005)

Structure of Iso-Symmetric Operators. - Bhagwati Prashad Duggal; In-Hyoun Kim (Axioms, 2021)

m-Isometric Operators with Null Symbol and Elementary Operator Entries. - Bhagwati Prashad Duggal (Axioms, 2025)

On m-Isometric and m-Symmetric Operators of Elementary Operators. - Bhagwati Prashad Duggal (Axioms, 2025)