Vision-based obstacle detection for rotorcraft flight. - Banavar Sridhar; Raymond E. Suorsa; Phillip N. Smith; Bassam Hussien (J. Field Robotics, 1992)

Passive range estimation for rotorcraft low-altitude flight. - Banavar Sridhar; Raymond E. Suorsa; Bassam Hussien (Mach. Vis. Appl., 1992)

A parallel implementation of a multisensor feature-based range-estimation method. - Raymond E. Suorsa; Banavar Sridhar (IEEE Trans. Robotics Autom., 1994)