APL WikiClassic papers on the use or history of APL.
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[http://www.vector.org.uk/typography/pview.htm A personal view of APL] K.E. Iverson, IBM Systems Journal, 30.4, 1991
[http://elliscave.com/APL_J/tool.pdf Notation as a tool of thought] K.E. Iverson, 1979 Turing Award Lecture
[http://www.research.ibm.com/journal/sj/032/falkoff.pdf A formal description of SYSTEM/360] A.D. Falkoff, K.E. Iverson and E.H. Sussenguth, IBM Systems Journal 3.3, 1964
[http://www.research.ibm.com/journal/sj/022/ibmsjIIRIID.pdf Programming notation in systems design] K.E. Iverson, IBM Systems Journal, 1963