Murphy G., Atanasoff J. V., "A mechanical device for the solution of equations involving the laplacian operator", Iowa Engineering Experiment Station, 1949;[1]Архив на оригинала от 2024-07-27 в Wayback Machine.
Larson, E. R. Findings of Fact, Conclusions of Law and Order for Judgement // File. No. 4 – 67 CIV. 138, Honeywell v. Sperry Rand Corporation and Illinois Scientific Developments Inc. US District Court, District of Minesota, Fourth Division,, 19 Oct. 1973. (на английски)
Murphy G., Atanasoff J. V., "A mechanical device for the solution of equations involving the laplacian operator", Iowa Engineering Experiment Station, 1949;[1]Архив на оригинала от 2024-07-27 в Wayback Machine.