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References

Regarding Middleton Solar UVR1-B2 Ultraviolet Pyranometer

Report of the 2nd International UV Filter Radiometer comparison UVC-II
PMOD/WRC, WCC-UV
Davos, Switzerland
25 May to 5 October 2017
G. Hülsen and J. Gröbner

Regarding Middleton Solar ACR-01 Active Cavity Radiometer

Report of the 4th WMO Regional Pyrheliometer  Comparison of RA II
Tsukuba, Japan
23 January to 3 February 2017
M. Omori, et al

Regarding Middleton Solar DN5 Pyrheliometer

Direct normal irradiance related definitions and applications: The circumsolar issue
Journal Solar Energy No. 110, P561-577 
P. Blanc, et al

An Extensive Comparison of Commercial Pyrheliometers under a Wide Range of Routine Observing Conditions
Journal of Atmospheric and Oceanic Technology
Volume 28 2011
American Meteorological Society
J. Michalsky, et al

Regarding Middleton Solar Sun Photometers

Aerosol Measurement in the Australian Outback: Intercomparison of Sun Photometers
Journal of Atmospheric and Oceanic Technology
Volume 20 2003
American Meteorological Society
R. M. Mitchell, B. W. Forgan

Field comparison of network Sun photometers
Journal of Geophysical Research
VOL. 108, NO. D19, 4596, doi:10.1029/2002JD002964, 2003
L. J. Bruce McArthur, et al