TY - JOUR T1 - On a Class of Partial Differential Equations of Mixed Type AU - M. Y. Chi JO - Journal of Partial Differential Equations VL - 1 SP - 43 EP - 52 PY - 1988 DA - 1988/01 SN - 1 DO - http://doi.org/ UR - https://global-sci.org/intro/article_detail/jpde/5851.html KW - AB -