Triangle singularity enhancing isospin violation in $D_s^ + \to {\pi ^ + }{\pi ^0}{f_0}(980)$ and $\overline B _s^0 \to J/\psi {\pi ^0}{f_0}(980)$ decays
1988 ◽
Vol 61
(23)
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pp. 2657-2660
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2001 ◽
Vol 521
(3-4)
◽
pp. 217-224
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