Electronic Design Magazine 9 April 26, 1976, p55-57. An electronic linesman decides where the tennis ball bounces. By John F. Mason pdf fileArchived 2016-03-03 at the Wayback Machine
Tennis Magazine January 1975, p20-22. Is the tennis lineman obsolete? by Ken Bentley. pdf fileArchived 2015-09-24 at the Wayback Machine
Electronic Design Magazine 9 April 26, 1976, p55-57. An electronic linesman decides where the tennis ball bounces. By John F. Mason pdf fileArchived 2016-03-03 at the Wayback Machine
Tennis Magazine January 1975, p20-22. Is the tennis lineman obsolete? by Ken Bentley. pdf fileArchived 2015-09-24 at the Wayback Machine