Now available online is my entry for the Oxford Research Encyclopedia/Religion: “Homa: Tantric Fire Ritual.” It is currently open access (free), but I don’t know how much longer that will be the case…
Richard K. Payne
Critical Reflections on Buddhist Thought: Contemporary and Classical
Richard K. Payne 
This looks very interesting and useful. FYI, “the ORE Religion module has not been in open access mode since April 2018.”