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Change citation style in `README.md` to Vancouver style #2876

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Run time

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Job	Run time
Ubuntu (g++, Debug, ubuntu-20.04)	12m 59s
Ubuntu (g++, Debug, ubuntu-22.04)	7m 9s
Ubuntu (g++, Release, ubuntu-20.04)	5m 13s
Ubuntu (g++, Release, ubuntu-22.04)	4m 46s
Ubuntu (clang++, Debug, ubuntu-20.04)	39m 41s
Ubuntu (clang++, Debug, ubuntu-22.04)	10m 12s
Ubuntu (clang++, Release, ubuntu-20.04)	8m 4s
Ubuntu (clang++, Release, ubuntu-22.04)	8m 50s
	1h 36m 54s