@Article{JPDE-1-21,
author = {Huang Sixun},
title = {On Properties of Some Operators in Douglis Algebra and Their Application to PDE},
journal = {Journal of Partial Differential Equations},
year = {1988},
volume = {1},
number = {1},
pages = {21--30},
abstract = {},
issn = {2079-732X},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/jpde/5849.html}
}