Looking for species identification keys for Lucanidae

[Hungry_Opossum]

Hello everyone,

 

I thought I would take the opportunity to reach out and ask if anyone has stag beetle identification resources/citations they are willing to pass along. I have most of what is available for North American species, but wouldn't mind expanding my Zotero to include anything I could use as reference for future identification (I'm aware that subspecies in southeast Asian stag beetles gets diverse). If anyone is interested I would also be willing to compile and publish a topic with everything formatted for easy reference.