I don't believe there's likely to be a source dedicated to just this question. I would have suggested you try ever smaller diyne and see if they exist. Its not likely a cyclic diyne exits if the complementary cyclic diene doesn't exist, and there's ring strain even on smaller cyclic alkanes. Unless you're looking for theoretical predictions based on bond lengths and hybridizations, but that's a pretty advanced topic. I'm also guessing, since you need a source or citation, you'd not be satisfied with buying a molecular modeling kit and seeing how small of one you can make without the model popping apart.