retrieve a physical reference
phref_list *getphref(ptfig, refname)
Pointer to the figure in which the reference should be seeked
Name of the reference
getphref looks in the list of references of the physical model pointed
to by ptfig for a reference identified by its refname.
getphref returns a pointer to the reference that matches the
"*** mbk error *** illegal getphref reference refname
in figure ptfig->NAME
No reference is called refname in the figure.
phref_list *exist(figname, refname)
char *figname, *refname;
return getphref(getphfig(figname), refname);