As noted previously, I'm working through a bunch of articles in my "to do" folder that got deprioritized for various reasons. This one is focused primarily on male relations, but does toss in an appendix with brief mentions of f/f possibilities.
Bremmer, Jan. 1980. “An Enigmatic Indo-European Rite: Paederasty” in Arethusa, Vol. 13, No. 2, Indo-European Roots of Classical Culture: 279-298.
Bremmer presents some anecdotal, cross-cultural evidence for classical Greek pederasty having structural similarities to some generational-initiation ceremonies or systems in “primitive” cultures, positing that it is, perhaps, a relic of a more widespread Indo-European practice. The body of the article is focused exclusively on male relations, however a very brief appendix reviews three brief references to a possible female parallel in Sparta that could expand understanding of the context of Sappho’s love poetry. The references are: