@article{NSR1973DU10, author="O. V. {Dumbrais} and F. {Nichitiu} and Y. A. {Scherbakov}", title="Application of the Accelerated Convergence Expansion to a Phase Shift Analysis of the Elastic $\pi \pm$ He$^{4}$ Scattering", journal="Rev.Roum.Phys.", year=1973, volume="18", pages="1249" }
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