There are a number of indexes for locating law journal articles, including Index to Legal Periodicals, Current Law Index, and Index to Foreign Legal Periodicals, which are available in the law library's print collection. The law library also subscribes to the LegalTrac database, which includes tax related articles (among other subjects) from 1980 until current.
There are also a few sources that focus specifically on listings of tax articles. The O'Quinn Law Library currently subscribes to CCH's Federal Tax Articles (KF6335.A6 C65), which is a print index that includes citations to tax related articles from about 250 sources. This one volume loose leaf set is updated monthly and boasts a number of advantages over using the general legal indexes such as only containing tax specific articles, allowing articles to be utilized by code section, and providing detailed summaries of each article.