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How to Make a Multiprocessor Computer That Correctly Executes Multiprocess Programs

... the result of any execution is the same as if the operations of all the processors were executed in some sequential order, and the operations of each individual processor appear in this sequence in the order specified by its program. A multiprocessor satisfying this condition will be called sequentially consistent.

Spanner docs:

Strong Consistency All accesses are seen by all parallel processes (or nodes, processors, etc.) in the same order (sequentially)5 In some definitions, a replication protocol exhibits "strong consistency" if the replicated objects are linearizable.

The 5 in that doc is a link to the wikipedia page, which apparently hasn't ever cited any sources. I can't seem to find any original source for it. The "some definitions" mentioned seem to be nowhere to find online.

What's the difference between strong and sequential consistency?

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