It's amazing how the authors and perpetrators of election fraud in the Donbass Region and Crimea failed to do some simple arithmetic that would have covered their tracks.
The following article (Google translations) performs a simple arithmetic analysis of election results and demonstrates that the numbers announced were doctored with an extremely high level of certainty.
The basic argument is this. In the overwhelming majority of cases election results look something like this: 73.2647586% In other words, the percentage is some long, "dirty" number. If, however, the results are short and clean — 73.26% for instance — this is cause for concern.
What we see in the case of the elections and memorandum discussed in the article is clear evidence of doctored results — short, clean percentages with a very small probability of occurring under normal circumstances.