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Parallel sparking: Many chips make light work, Douglas Heaven, New Scientist magazine, issue 2930, August 19, 2013, p44. Online (by subscription)Archived October 6, 2014, at the Wayback Machine
Jones, Michael B. (December 16, 1997). "What really happened on Mars?". Microsoft.com. Archived from the original on June 12, 2015. Retrieved June 10, 2015.