Re: Natural Cell vs. Small Cell
No I'm not aware of any literature to support the latter, or the former.
However it is quite a leap of faith to say 5.3 mm foundation is resposible for the introduction of varroa mites and all the other nasties we have now. In fact, the first honeybees reported to have varroa mites (russians), were not on comb foundation at all, they were on natural comb and had not been modified. Over the next century or so, varroa mites were spread from them to other bees by that modern thing, mass transportation. Same as all the other pests.
44 years, been commercial, outfits up to 4000 hives, now 120 hives and 200 nucs as a hobby, selling bees. T (mostly).