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It is certainly very common to use a single parenthesis for an enumerated lists. For example, the Applied Geography Conferences Author Instructions say: Where lists are used, each item should ...
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#2: Initial revision
It is certainly very common to use a single parenthesis for an enumerated lists. For example, the _Applied Geography Conferences_ [Author Instructions](http://applied.geog.kent.edu/AGC%20Submission%20Guidelines.pdf) say: > Where lists are used, each item should be numbered (with the number and a single parenthesis: 1) e.g.), with numbered items separated by double spacing.