1. Invariant imbedding and radiation dosimetry: I, finite order scattering and transmission functions;Bellman;Mathematical Biosciences,1972
2. invariant imbedding and radiation dosimetry: II, integral recurrence relations for the finite order scattering and transmission functions;Bellman,1972
3. Invariant imbedding and radiation dosimetry: III, integral recurrence relations for X and Y functions;Bellman,1972
4. Invariant imbedding and radiation dosimetry: IV, finite order scattering of gamma radiation by target slab;Bellman,1972
5. Invariant imbedding relation for the principles of invariance;Preisendorfer;Proc. Nat. Acad. Sci.,1958