Johnson, G. A., & O’Foghludha, F. (1978). An experimental "trans-molybdenum" tube for mammography. Radiology, 127(2), 511–516. https://doi.org/10.1148/127.2.511

Johnson, G. A., Manson, E. L., & O’Foghludha, F. (1978). Simple method of obtaining Si(Li) detector efficiency. Nuclear Instruments and Methods, 151(1–2), 217–220. https://doi.org/10.1016/0029-554X(78)90491-3