[Tugindia] Extended natbib functions

[David M. Arthur]

Hello all,

I am trying to use the \citetext and \defcitealias options of the natbib
package and I am receiving undefined control sequence errors when I try to
compile the document.

The \citep and \citet commands work fine, but I cannot figure out why I
would be receiving errors for \citetext and \defcitealias.  I am using the
plainnat bibliography style and have included the natbib package in the
document.

Any help would be greatly appreciated, I am pulling my hair out over this!

Cheers,
David Arthur