BibTeX reference

@article{Pears1989,
  author="N. E. Pears and J. R. Bumby",
  title="Guidance of an Autonomous Guided Vehicle using Low-level Ultrasonic and Odometry Sensor Systems",
  journal="IEE Trans. Inst. Measurement and Control",
  year="1989",
  vol="11",
  number="5",
  pages="231-248"
}