Ken's essay "Notation as a Tool of Thought" is available for free at:
http://elliscave.com/APL_J/tool.pdf
I've also added the prologue from that essay to the Wiki:
http://www.jsoftware.com/jwiki/Essays/Notation_as_a_Tool_of_Thought
(please delete it if it violates copyright or courtesy).
-Dan
PS: By the way, the J Bibliography links to many nice J and APL resources:
http://www.jsoftware.com/jwiki/Essays/Bibliography
That's how I found the free version of the notation essay.
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