1. Fiberglass-Reinforced Plastic: "FRP Roof Decks: A Solution for Challenging Conditions" is a decent starting point for information about this type of roof deck. The article comes across as trying to promote FRP, but it still has useful information. From the November 2011 issue of Interface magazine. Available on the website of RCI, Inc.
2. Lightweight Insulating Concrete: "Lightweight Insulating Cellular Concrete: A Seamless Roof Deck Installation" by Leo A. Legatski is a good basic introduction to this material. Available on the RCI, Inc. website in the May 2000 issue of Interface magazine.