Assuming the user is looking for academic papers, there might be a challenge here. If "Graias Petra" is not a widely recognized figure, there might not be many academic papers on it. Alternatively, maybe it's a term from a specific field that I'm not aware of. The user might be conflating two different terms. For example, "Græya" could be a name from a book, and "Petra" might be a different concept. "Initiation" is a term used in various contexts: religious rites, social groups, etc.