Here's a few links i dearly recommend to check through.Different
authors analise the myths regarding their simmilarities between
themselves and try to seek the reasons for that in general known
historical development of different cultures:
EVOLUTION_OF_CHARACTERS_IN_MYTHOLOGIES
(great study on development of mythologies by A.Fantalov,
also great artist who devoted much of his work to the myth themes,
see also his gallery of paintings)
