Using GPS-Enabled Cell Phones for Traffic-Flow Data Collection. - Bruce Beyeler; David C. Pheanis (CATA, 2005)

Measuring Cell-Phone GPS Accuracy. - Bruce Beyeler; David C. Pheanis (CATA, 2006)

Cell-Phone Accuracy Tests: Data-Collection Techniques. - Bruce Beyeler; David C. Pheanis (CATA, 2007)