Writing and Grammar issues

Whilst writing my dissertation, I have come across some minor issues concerning grammar and word use.

For example the use of who or whom and the correct use of apostrophes.

These sites shed some light,

Who and Whom
http://web.ku.edu/~edit/whom.html

Apostrophes

http://www.bbc.co.uk/dna/h2g2/A790175

I also discovered that preccuring is not a word. Well it is now.

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