TY - Jour Au - Burmistrova，Valentina Py - 2005 DA - 1900/01/01 - 抛物线方程与可变运算符SP - 265261 VL - 2005 AB - SN - 1110-757X UR - https：//doi.org/10.1155/Jam2005.383 Do - 10.1155 / Jam2005.383 JF - 应用数学PB - Hindwi Publishing Corporation KW - ER -