there are many older threads discussing similar ways.
My convention is
seriesname [1.06] , seriesname [7.12] for ranges <very few series go to 3 digits. I would just infer the leading digit on the upper end>
seriesname [3.5] is a half way
seresname [0] no order placement, belongs, but no order, I also use for an Index or glossary Book covering the series
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