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  Author Title Year Publication Volume (down) Pages Links
Bergen; F.; Abs, M. Etho-ecological study of the singing activity of the blue tit (parus caeruleus), great tit (parus major) and chaffinch (fringilla coelebs). 1997 J Ornithol 138 451-467 details   openurl
Crawford, D. L. Photometry: teminology and units in the lighting and astronomical sciences 1997 The Observatory 117 14–18 details   url
Roenneberg, T.; Foster, R.G. Twilight Times: Light and the Circadian System 1997 Photochemistry and Photobiology 66 549-561 details   doi
Elvidge, C.D.; Baugh, K.E.; Kihn, E.A.; Kroehl, H.W.; Davis, E.R. Mapping city lights with night-time data from the DMSP operational linescan system. 1997 Photogrammetric Engineering and Remote Sensing 63 727-734 details   url
Elvidge, C. D.; Baugh, K. E.; Kihn, E. A.; Kroehl, H. W.; Davis, E. R. Mapping city lights with nighttime data from the DMSP Operational Linescan System. 1997 Photogrammetric Engineering and Remote Sensing 63 727–734 details   openurl
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