One other paper that may be of interest is Hunt and d' Arge "Environmental Pollution, Externalities, and Conventional Wisdom: A Critique."  This article appears in Environmental Affairs in January of 1971.  Although the article does not explicitly highlight the Invisible Foot, it outright dismisses the efficacy of tradeable pollution schemes while offering very explicit criticism of Pigovian tax solutions.  As an aside, this article notes the concept of the "Pig Principle" which is a theme that Hunt and d' Arge mention in conjunction with the Invisible Foot in "On Lemmings and Other Acquisitive Animals," as well as in Hunt's "Critique of Welfare Economics."  To reiterate these are excellent sources for those interested in radical critiques of neoclassical solutions to the externality problem and the relationship of these solutions to neoclassical welfare economics.  
 
Justin A. Elardo