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Here is behavior that surprised me and took me a while to track down, so I thought I would share it. In

\documentclass{article}
\usepackage[backend=biber,style=authoryear]{biblatex}
\bibliography{test}
\begin{document}
\textcite{fama-french:1992},
\textcite{fama-french:1997},
\textcite{fama-french:2002},
\printbibliography
\end{document}

with the test.bib file of

@article{ fama-french:1997,
  year =         1997 ,
  author =       { Eugene F. Fama And Kenneth R. French },
  title =        { Industry costs of equity },
  journal =      { Journal of Financial Economics },
  volume =       43,
  pages =        { 153 - 193 }
}

@article{ fama-french:2002,
  year =         2002,
  author =       { Eugene F. Fama and Kenneth R. French },
  title =        { The Equity Premium },
  volume =       57,
  journal =      { The Journal of Finance },
  pages = { 637-659 }
}

@article{ fama-french:1992,
  year =         1992,
  author =       { Eugene F. Fama and Kenneth French },
  title =        { The Cross-Section of Expected Stock Returns },
  volume =       47,
  journal =      { The Journal of Finance },
  pages =        { 427-465 }
}

then the latex file will cite as Fama and K. French (1992) (and Fama and K.R. French (1997)) instead of Fama and French (1992). Apparently, if initials are not completely identical, then the year alone is not sufficient disambiguation. it's probably a feature rather than a bug, but not immediately obvious behavior.

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