\input zb-basic
\input zb-ioport
\iteman{io-port 50307585}
\itemau{Hasanov, Vejdi I.}
\itemti{Notes on two perturbation estimates of the extreme solutions to the equations X+/$-A^{*}X^{-1}$A=Q}
\itemso{Applied Mathematics and Computation 216, No. 5, 1355-1362 (2010).}
\itemcc{}
\itemut{}
\itemli{doi:10.1016/j.amc.2010.02.044}
\end