refer: implies intentional introduction, specific and definite mention, and sometimes judging: ~ to her claim as fantasy


allude: sug. an indirectmention by a hint, roundabout expression or figure of speech: ~ to incidents previously unkonwn.


advert: usually implies a slight or glancing reference in a text or speech: a theory ~ed to here but discussed later.


refer参考: 指介绍提到或判定, allude: 间接提到, advert: 稍微提到。


记忆方法:1) 3个词都表示提到，refer是基础词，allude偏重间接，advert偏重稍微(广告advertisement是短暂提及)。
   

        2）介词都用to。

        3）提及的意思是使注意mean to call or direct attention to something.