@article{yang2021where,
    title={Where Were the Repair Ingredients for Defects4J Bugs? Exploring the Impact of Repair Ingredient Retrieval on the Performance of 24 Program Repair Systems},
    author={Yang, Deheng and Liu, Kui and Kim, Dongsun and Koyuncu, Anil and Kim, Kisub and Tian, Haoye and Lei, Yan and Mao, Xiaoguang and Klein, Jacques and Bissyand{\'e}, Tegawend{\'e} F.},
    journal={Empirical Software Engineering},
    volume= {26},
    number= {6},
    pages= {122},
    year= {2021},
    url= {https://doi.org/10.1007/s10664-021-10003-7},
    doi={10.1007/s10664-021-10003-7},
    publisher={Springer}
}