Yes, that paper illustrates what many of us have already known:
1) Members of the Araryllidaceae family propagate better with the inclusion of part of the basal plate of the bulb. This is difficult to accomplish with single scales as most species in this family don't have scales that separate easily, and including part of the basal plate is thus even more challenging. So securing part of the basal plate is much more easily done with twin (or multi) scaling, especially with smaller bulbs.
2) With members of the liliaceae (Lily) family, inclusion of the basal plate is not really that beneficial (but not detrimental either). So lily propagators don't twin scale, since it requires the probable destruction of the mother bulb.
It was interesting to note that for lilies, the scaling media of peat, Japanese cedar (Cryptomeria) or vermiculite worked better than perlite or sawdust. Also, that they were incubated at 25°C (77°F).
