Inferno (operating system) (1997) by Ken Thompson
	Plan 9 from Bell Labs (operating system) (1992) by Ken Thompson
	Project Oberon: The Design of an Operating System and Compiler (1992) by Niklaus Wirth
	Project Oberon: The Design of an Operating System and Compiler (2nd Edition) (2001) by Niklaus Wirth
	Solution of a Problem in Concurrent Programming Control (1965) by Edsger Dijkstra
	The Structure of the 'THE' Multiprogramming System (1968) by Edsger Dijkstra
	The UNIX Time-Sharing System (1974) by Ken Thompson