How to refer to group in Doxygen

Question

I understand that we can use \defgroup key word to define a group in doxygen and add the class in this group by using key word \addtogroup. My question is how can I refer to this group in the documentation. For example,

/**
* \defgroup abc abc
*/

  /**
  * \addtogroup auxiliary_functions
  * @{
  */

 /**
 * Introduction to A. 
 */
 class A
  {

 };
/*
  * @}
*/

Then, in a page section, how can refer abc group?

/** @page tttt
*   how to refer to group abc?
*
*/

Answer 1

You can reference any group by using its label. In your case, to reference the abc group from page ttt use the following

/** @page tttt
 *   
 * For more information, please see @ref abc
 */

The resulting page will contain a link to your group, the text of which will reflect the group's title (abc in your case).

Answer 2

As far as I know by using the keyword ingroup

/**
 * \ingroup abc
 * \brief   Explain why
 */
extern int VarInA;

You can find more here: Grouping doc