It would be great
- to use only
\medcircand\circledtimesfrom thepxfontsor - to design the similar symbols by other techniques.
The symbols from pxfonts are quite well but when I connect the package, all symbols from the text are substituted by the symbols from pxfonts.
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{pxfonts}
\begin{document}
1. Only medcirc and cirledtimes symbols are required from pxfonts: \par
$\cdot^{\medcirc}$ and $\cdot^{\circledtimes}$.\par
2. The problem is that all symbols are substituted by pxfonts package,
for example, just look at the text and formula $g(f)=a$.
\end{document}

There are similar problems with pxfonts, but they seem to be unsolved. Perhaps, it's better to design the symbols by other ways.

