TITLE: Is there any publication of Bombieri about the standard conjectures on algebraic cycles?
QUESTION [19 upvotes]: In "Standard conjectures of algebraic cycles" Grothendieck says:

"... These [Standard conjectures] are not really new, and they were worked out about three years ago independently by Bombieri and myself..."

Did Bombieri publish something of this work?

REPLY [12 votes]: Here's Bombieri's publication list and there seems to be just one paper that could qualify [1], unfortunately not available online. A later paper with Andreotti [2] is online, but does not quite seem to be the one. 
[1] E. Bombieri, Varieta algebriche omeomorfe (1968).
[2] A. Andreotti and E. Bombieri, Sugli omeomorfismi delle varieta algebraiche (1969).
Incidentally, it seems Grothendieck was alerted to Bombieri's work by Serre in a letter from 1964: