[1] Greguss P. The Tube Peeper: A New Concept in Endoscopy[J]. Optics and laser technology, 1985, 17(1) : 41-45.
[2] Matthys D R, Gilbert J A, Greguss P. Endoscopic Measurement Using Radial Metrology with Digital Correlation[J]. Opt. Eng, 1991, 30(10) : 1455-1460.
[3] Greguss P. Panoramic Imaging Block for Three-Dimension Space[P]. U. S. Patent: 4566763, 1986-01-28.
[4] Gilbert J A, Fair S, Caldwell S, et al. A Hemispherical Imaging and Tracking (HIT) System: AIAA92-2805[A]. AIAA SDIO Annual Interceptor Technology Conference [C]. Huntsville:[s.n], 1992.
[5] Powell I. Panoramic Lens[J]. Appl. Opt, 1994, 33(31) : 7356-7361.