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     aaa & b \\ 
     c & ddddd\\ 
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     aaaa & b \\ 
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     c & ddddd\\ 
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       a & b \\ \hline 
       c & d\\ 
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\documentclass{article}
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@article{rivero2001resistance,
title={Resistance to cold and heat stress: accumulation of phenolic compounds in tomato and watermelon plants},
author={Rivero, Rosa M and Ruiz, Juan M and Garc{\i}a, Pablo C and L{\‘o}pez-Lefebre, Luis R and S{\‘a}nchez, Esteban and Romero, Luis},
journal={Plant Science},
volume={160},
number={2},
pages={315--321},
year={2001},
publisher={Elsevier}
}

@article{gostout1992clinical,
title={The clinical and endoscopic spectrum of the watermelon stomach},
author={Gostout, Christopher J and Viggiano, Thomas R and Ahlquist, David A and Wang, Kenneth K and Larson, Mark V and Balm, Rita},
journal={Journal of clinical gastroenterology},
volume={15},
number={3},
pages={256--263},
year={1992},
publisher={LWW}
}
\end{document}