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2.            Joint spectrum of subnormal operators, Math. Student. 50 (1982) 124-128.

3.            Tensor products of hyponormal operators and joint spectra., SPURJ 1(1) (1982) 87-100.

4.            A joint spectral theorem for unbounded normal operators, Jour. Australian Math. Soc. (series A) 34 (1983), 203-213.

5.            Joint essential spectra, Czechoslovak Math. Jour. Praha, 34 (109) (1984) 598-603.

6.            A note on joint norms, Indian Jour Pure. Appl. Math. 15(11) (1984) 1199-1205. (With S. J. Bhatt).

7.            On joint norms, Glasnik Mat. 20(40) (1985), 93-98. (With S. M. Patel).

8.            An Ascoli-Arzela theorem for differentiable function, Math. Student. 56 (1988) 184-188.

9.            On unbounded subnormal operators Proc. Indian Acad. Sci. 99(1) (1989) 85-92. (With S. J. Bhatt).

10.            On scattering theorems of Pearson and Ismagilov, Jour. Functional Analysis          88(1) (1990) 228-232.

11.            A note on the converse of Kato-Rosenblum theorem, Prajna, Journal Of Sardar Patel University, (1995) 27-29.

12.            On seminorm with multiplicativity factors on involutive algebras, Math. Today 16 (1998) 17-24 (With S. J. Bhatt).

13.            On Normal Extension of Unbounded Operators, Math. Today 17 (1999) 41-44.

14.            On Product of Unbounded Operators, Prajna, J. of Sardar Patel University, Vol. 9, (1999).