求助Davis的三篇文章，最近看文献总有引用这三篇的，大家帮忙传一下吧，谢谢啦

Davis FD. Perceived usefulness perceived ease of use and user acceptance of information technology. MIS Quart 1989;13(3):318–40.

Davis FD. User acceptance of information technology: system characteristics, user perceptions and behavioral impacts. Int J Man Mach Stud 1993;38(3):475–87.

Davis FD, Bagozzi RP, Warshaw PR. User acceptance of computer technology: a comparison of two. Manage Sci 1989;35(8):982–1002.