@Article{JPDE-2-71,
author = {Liu Xiyuan},
title = {On the Frechet Differentiability of Free Boundary Operator for a Muskat Type Problem},
journal = {Journal of Partial Differential Equations},
year = {1989},
volume = {2},
number = {1},
pages = {71--94},
abstract = {},
issn = {2079-732X},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/jpde/5822.html}
}