A low-cost bench-top research device for turbidity measurement by radially distributed illumination intensity sensing at multiple wavelengths oleh Ben G.B. Kitchener, Simon D. Dixon, Kieren O. Howarth, Anthony J. Parsons, John Wainwright, Mark D. Bateman, James R. Cooper, Graham K. Hargrave, Edward J. Long, Caspar J.M. Hewett