Journal of Mathematical Sciences: Advances and Applications
OPERATORS[1] P. R. Halmos, A Hilbert Space Problem Book, Springer-Verlag, New
York, 1982.
[2] A. A. S. Jibril, On subprojection operators, Int. Math. Journal
4(3) (2003), 229-238.
[3] A. A. S. Jibril, On almost subprojection operators, Int. Math.
Forum 2(52) (2007), 2571-2578.
[4] E. Kamei, Operators with skew-commutative Cartesian parts, Math.
Japonica 25(4) (1980), 431-432.
