Bruce, W. R.; Pearson, M. L.; Freedhoff, Helen S. (August 1963). "The Linear Energy Transfer Distributions Resulting from Primary and Scattered X-Rays and Gamma Rays with Primary HVL's from 1.25 mm Cu to 11 mm Pb". Radiation Research. 19 (4): 606. Bibcode:1963RadR...19..606B. doi:10.2307/3571481. JSTOR3571481.
Freedhoff, Helen; Kranendonk, J. Van (May 1967). "Theory of Coherent Resonant Absorption and Emission at Infrared and Optical Frequencies". Canadian Journal of Physics. 45 (5): 1833–1859. Bibcode:1967CaJPh..45.1833F. doi:10.1139/p67-142.
Freedhoff, Helen S. (1 March 1979). "Collective atomic effects in resonance fluorescence: Dipole-dipole interaction". Physical Review A. 19 (3): 1132–1139. Bibcode:1979PhRvA..19.1132F. doi:10.1103/PhysRevA.19.1132.
Freedhoff, Helen (23 January 2004). "Evolution in time of an N-atom system. I. A physical basis set for the projection of the master equation". Physical Review A. 69 (1): 013814. Bibcode:2004PhRvA..69a3814F. doi:10.1103/PhysRevA.69.013814.
Bruce, W. R.; Pearson, M. L.; Freedhoff, Helen S. (August 1963). "The Linear Energy Transfer Distributions Resulting from Primary and Scattered X-Rays and Gamma Rays with Primary HVL's from 1.25 mm Cu to 11 mm Pb". Radiation Research. 19 (4): 606. Bibcode:1963RadR...19..606B. doi:10.2307/3571481. JSTOR3571481.
Freedhoff, Helen; Kranendonk, J. Van (May 1967). "Theory of Coherent Resonant Absorption and Emission at Infrared and Optical Frequencies". Canadian Journal of Physics. 45 (5): 1833–1859. Bibcode:1967CaJPh..45.1833F. doi:10.1139/p67-142.
Freedhoff, Helen S. (1 March 1979). "Collective atomic effects in resonance fluorescence: Dipole-dipole interaction". Physical Review A. 19 (3): 1132–1139. Bibcode:1979PhRvA..19.1132F. doi:10.1103/PhysRevA.19.1132.
Freedhoff, Helen (23 January 2004). "Evolution in time of an N-atom system. I. A physical basis set for the projection of the master equation". Physical Review A. 69 (1): 013814. Bibcode:2004PhRvA..69a3814F. doi:10.1103/PhysRevA.69.013814.
Bruce, W. R.; Pearson, M. L.; Freedhoff, Helen S. (August 1963). "The Linear Energy Transfer Distributions Resulting from Primary and Scattered X-Rays and Gamma Rays with Primary HVL's from 1.25 mm Cu to 11 mm Pb". Radiation Research. 19 (4): 606. Bibcode:1963RadR...19..606B. doi:10.2307/3571481. JSTOR3571481.
Heap, Ruby; Millar, Wyn; Smyth, Elizabeth M (2005). Learning to practise: professional education in historical and contemporary perspective. Ottawa: University of Ottawa Press. ISBN978-0776606057. OCLC243568253.