1. Stecher, R., Elektronische Zeitintervallmessung mit Nanosekunden-Ausflòsung, Nachrichtentechnik, Vol. 23, 1973.
2. Chu D.C., Ferguson K.M., Ovenless Oscillators Will Resolve 20-Picoseconds Pulses, Electronics, Vol. 50, No. 24, 1977.
3. Martin D., Measure Time Interval Precisely, Electronic Design, Vol. 24, Nov. 22, 1974.
4. Miyake, K., Correction for Errors in Optical Pulsed Range Measurement, Applied Optics3 Vol. 14, No. 3, March 1975.
5. Mamon G., Youmans D., Optical Pulsed Ranging: Method for Improving Measurement Accuracy: Comment, Applied Optics, Vol. 16, No. 1, January 1977.