@article{NSR1983MA44, author="R. {Mach}", title="Galileo-Invariant Theory of Low Energy Pion-Nucleus Scattering III. The $\pi ^{-}$ - $^{4}$He Reaction and Light $\pi$-Mesoatoms", journal="Czech.J.Phys.", year=1983, volume="B33", pages="772" }
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