To reference other classes, you must use the command ref. You can use the command \link, but you must end your link text with the command \endlink, which I suspect is your problem (although without an example of documentation I cannot be sure).
In the doxygen auto-binding manual section that I suggest you read, there is an item about class references:
, , , . , , , , % . , \ref.
:
Doxygen \see ( \sa) \link. , OP , , .
{\command description} { } doxygen, , , , , .