See also

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In formal legal writing, a signal indicating that the cited source provides additional support for the statement after primary supporting sources have already been cited.  Thus, see also citations most appropriately follow sources that have been cited with the see signal or no signal at all.

In general writing, see also may be used not as a signal for supporting sources, but as a way to suggest other ideas that may be of interest to the reader because of their similarity to the discussion at hand.