Journal articles on administrative law can be found via the SLU Law Library catalog. Below are a sample of somewhat recent articles that I located by entering "administrative law" in the SLUth Search Plus search window under the Search tab (http://www.slu.edu/colleges/law/library/). You can then limit your search to Academic Journals under "Source Type" as well as narrowing the results by publication date and geography (e.g., to select United States only).
Epstein, Richard A. "The Perilous Position of the Rule of Law and the Administrative State." Harvard Journal of Law and Public Policy 36.1 (2013): 5-19. Web.
Farber, Daniel A. and O'Connell, Anne Joseph. "The Lost World of Administrative Law." Texas Law Review 92.5 (2014): 1137-1189. Web.
Heinzerling, Lisa. "The FDA's Plan B Fiasco: Lessons for Administrative Law." Georgetown Law Journal 102.4 (2014): 927-989. Web.