Journal article with two DOIs

William F.Sharpe
"Capital asset prices: a theory of market equilibrium under conditions of risk"
The Journal of Finance
Vol.19, No.3 (September 1964)
pp.425-442

https://doi.org/10.1111/j.1540-6261.1964.tb02865.x
https://doi.org/10.2307/2977928

Why this happens?188BET靠谱吗What DOI should I pick for my Zotero entry?
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