Brad's series is now over a decade old, so it would be useful to find out what trends or conventions may have changed in recent years. I found the AllBusiness series to be very good, though having never read anything on their site before and don't know how reliable their guidance is.

I've found a couple other standalone articles [3, 4] related to LOIs or term sheet negotiation (which has some similar aspects), but would be interested to hear what resources others might suggest.

1: http://www.feld.com/archives/category/term-sheet/page/12

2: https://www.allbusiness.com/negotiating-an-acquisition-letter-of-intent-23776-1.html

3: http://billburnham.blogs.com/burnhamsbeat/2008/04/5-keys-to-maste.html

4: https://www.allbusiness.com/22-mistakes-made-by-sellers-in-ma-transactions-22061-1.html/6