from Andrew Brown:Dear Andrew Brown,
He references primarily classics or old, obscure references ... one of which is Thomas Flatman, an English poet 1637-1688, who wrote a poem called A Thought of Death which you may want to read. The Flatman reference is made by Kinbote speaking with Shade and the guys in the commentary note where one of the guys is trying to pronounce Professor Pnin's name. Make sure to give me credit for what you find there.