TY - JOUR T1 - On Properties of Some Operators in Douglis Algebra and Their Application to PDE JO - Journal of Partial Differential Equations VL - 1 SP - 21 EP - 30 PY - 1988 DA - 1988/01 SN - 1 DO - http://doi.org/ UR - https://global-sci.org/intro/article_detail/jpde/5849.html KW - AB -