Identifying Contingency Requirements Using Obstacle Analysis. - Robyn R. Lutz; Stacy Nelson; Ann Patterson-Hine; Chad R. Frost; Doron Tal (RE, 2005)

Using obstacle analysis to identify contingency requirements on an unpiloted aerial vehicle. - Robyn R. Lutz; Ann Patterson-Hine; Stacy Nelson; Chad R. Frost; Doron Tal; Robert Harris (Requir. Eng., 2007)