\cite 中未定义的控制序列错误

Question

 \documentclass{aa}  
    \begin{document}
 Most ordinary chondrites have lower coercivity than their main constituent ferromagnetic phases (\‍‍‍cite{gattacceca2003magnetic}). Different meteorites have significantly different magnetic properties. The coercivity of different meteorite classes is 1.78 mT for H chondrites, 5.62 mT for L chondrites and 36.40 mT  for LL chondrites.  This is true that LL chondrites have higher coercivity than L and H chondrites, because of increasing Fe content of the silicates from H to LL chondrites (\‍‍‍‍cite{gattacceca2003magnetic}). 

    \‍‍‍‍end{document}

参考文献：

@article{gattacceca2003magnetic,
  title={Magnetic properties of a freshly fallen LL ordinary chondrite: the Bensour meteorite},
  author={Gattacceca, J{\'e}r{\^o}me and Rochette, Pierre and Bourot-Denise, Mich{\`e}le},
  journal={Physics of the Earth and Planetary Interiors},
  volume={140},
  number={4},
  pages={343--358},
  year={2003},
  publisher={Elsevier}
}

错误：

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