Single diaphragm, flexible, multiple port system in betatron therapy.

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@article{Sassoon1967SingleDF, title={Single diaphragm, flexible, multiple port system in betatron therapy.}, author={H F Sassoon and H Levan}, journal={The American journal of roentgenology, radium therapy, and nuclear medicine}, year={1967}, volume={99 2}, pages={444-5} }