Introduction to the X-Window System O. Jones (Book, 1985)
The Paradyn Parallel Performance Measurement Tools B. P. Miller; M. D. Callaghan; J. M. Cargille; J. K. Hollingsworth; R. B. Irvin; K. L. Karavanic; K. Kunchithapadam; T. Newhall (Article, 1995)