In declarative sentences, if an abbreviation that takes a final point ends the sentence, finish the sentence with just one final point/full stop.

Small_OK The new faculty service provides updates on roundtables, forums, seminars, courses, etc.
Small_OK This research is the initiative of a number of companies, including Apple Inc.
Small_OK The tour of the Aula Magna will end at 2.30 p.m.

In the case of questions and exclamations, however, finish the sentence with the final point of the abbreviation followed by a question mark or exclamation mark.

Small_OK Can this department really base its future decisions on the findings of Brown et al.?
Small_OK This was hardly the position adopted by Washington D.C.!

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