急需Vorpérian的论文Simplified Analysis of PWM Converters Using the Model of the PWM S

本人需要Vorpérian 1990年在IEEE Transactions on Aerospace and Electronics Systems, vol. 26, no. 3, May 1990.上发表的论文“Simplified Analysis of PWM Converters Using the Model of the PWM Switch, Parts I”，若那位大侠能上传该文件，本人不胜感激。