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Fletcher, M. J., Warwick, K. and Mitchell, R. (1991) Application of a hybrid tracking algorithm to motion analysis. In: Proceedings. 1991 IEEE Computer Society Conference on Computer Vision and Pattern Recognition. IEEE, pp. 84-89. ISBN 0818621486 doi: https://doi.org/10.1109/CVPR.1991.139666

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United Kingdom Atomic Energy Authority (1991) Eddy current testing program with scanning probe head having parallel and normal sensing coils. US5019777. doi: US5019777

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Hawkins, G. J., Hunneman, R. and Seeley, J. S. (1991) Exposure to space radiation of high performance infrared multilayer filters and materials technology experiment. In: LDEF—69 Months in Space: Proceedings of the First Post-Retrieval Symposium, June 2-8, Kissimmee, Florida, pp. 1479-1492.

Hawkins, G. J., Hunneman, R. and Seeley, J. S. (1991) Space exposure of infrared filters and materials on the NASA Long Duration Exposure Facility (LDEF). In: Space Exposure of Infrared Filters and Materials on the NASA Long Duration Exposure Facility (LDEF). University of Reading. ISBN 9780704904095

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Mitchell, R. J. (1991) Modula-2 applied. Macmillan Computer Science Series. Macmillan. ISBN 9780333554531

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Zheng, A. M., Seeley, J. S., Hunneman, R. and Hawkins, G. J. (1991) Design of narrowband filters in the infrared region. Infrared Physics and Technology, 31 (3). pp. 237-244. ISSN 1350-4495 doi: https://doi.org/10.1016/0020-0891(91)90053-I