Most of the material on anarcho-capitalism I am familiar with is book-length rather than article length, and so would perhaps not be suitable for your purposes. The articles I know tend to focus on quite specific aspects of AC theory rather than providing a survey of the whole. The Wikipedia entry on Anarcho-Capitalism, however, is useful. (https://en.wikipedia.org/wiki/Anarcho-capitalism) It offers a brief but reasonably comprehensive survey of the whole area, plus some very useful references to both non-fiction and (which is good for students) fiction material. Also useful is Lew Rockwell’s ‘Can Anarcho-Capitalism Work?’, available at https://en.wikipedia.org/wiki/Anarcho-capitalism. The Wikipedia entry on ‘Anarchism and Anarcho-Capitalism’ situates AC in the broader context of anarchism. You can find it at https://en.wikipedia.org/wiki/Anarcho-capitalism.