J. M. Ruijter, J. Hagoort, P. A. D. Boer, and A. F. Moorman, “CALIBRATION OF DENSITOMETRY IN RADIO-ISOTOPIC IN SITU HYBRIDIZATION”, Image Anal Stereol, vol. 20, no. 3, pp. 219–224, May 2011, doi: 10.5566/ias.v20.p219-224.