A Statistical Examination of The Evolution of the UNIX System
Shamim Sharifuddin Pirzada
September 1988
PhD thesis
Imperial College London

Added to TUHS with the permission of the author.
https://www.tuhs.org/pipermail/tuhs/2026-April/033592.html

Currently available at https://spiral.imperial.ac.uk/entities/publication/700a4f59-117e-4a67-a5be-e1a4c0ef396d
and previously at https://web.archive.org/web/20230223010057/https://spiral.imperial.ac.uk/bitstream/10044/1/7942/1/Shamim_Sharfuddin_Pirzada-1988-PhD-Thesis.pdf