References

ON OPERATORS WHOSE SQUARES ARE 2-NORMAL


[1] S. K. Berberian, Introduction to Hilbert Spaces, Chelsea Publishing Company, New York, 1976.

[2] P. R. Halmos, A Hilbert Space Book, Springer-Verlag, New York, 1982.

[3] A. A. S. Jibril, On 2-normal operators, Dirasat, Natural and Engineering Sciences 23(2) (1996), 190-195.

[4] A. A. S. Jibril, On subprojection operators, International Mathematical Journal 4(3) (2003), 229-238.

[5] A. A. S. Jibril, On almost subprojection operators, International Mathematical Forum 2(52) (2007), 2571-2578.

[6] A. A. S. Jibril, Further results on 2-normal operators, Mutah Lil-Buhuth Wad-Dirasat 22(1) (2007).

[7] A. A. S. Jibril, On almost 2-normal operators, J. Math. Sci. 19(2) (2008), 231-238.

[8] A. A. S. Jibril, On n-power normal operators, The Arabian Journal for Science and Engineering 33(2A) (2008), 247-251.

[9] E. Kamei, Operators with skew commutative parts, Math. Japonica 25(4) (1980), 431-432.

[10] M. M. Kutkut, On the class of parahyponormal operators, J. Math. Sci. 4(2) (1993), 73-88.