MathSciDoc: An Archive for Mathematician ∫

@inproceedings{w.1968a,
  title={A free boundary problem and an extension of Muskat's model},
  author={W. Fulks, and R. B. Guenther},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203217209954075},
  booktitle={Acta Mathematica},
  volume={122},
  number={1},
  pages={273-300},
  year={1968},
}