You can use HeinOnline's SmartCILP to learn when new articles are published in a particular subject area. SmartCILP provides weekly email listings of all the articles that have been published in a selected area or selected areas. It incudes links to the articles in HeinOnline, Lexis, and Westlaw. You must have a MyHein account to use SmartCILP. You can find out more about SmartCILP, including how to sign up, from the HeinOnline Resource Guide.
Here is a complete list of over 100 CILP subject headings, including Administrative Law.