TY  - RPRT
TI  - Applicability of the diffusion approximation
AU  - Biryukov, Y. L.
AU  - Titarchuk, L. G.
AU  - Chesnokov, Y. M.
PY  - 1974
UR  - https://ntrs.nasa.gov/citations/19750003356
ID  - 19750003356
ER  -