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Armstrong, Joe. “Making Reliable Distributed Systems in the Presence of Software Errors.” PhD thesis, Royal Institute of Technology, Stockholm, 2003. PDF
，这一点在搜狗输入法中也有详细论述
The price upon introduction in 1991 was around $15,000 for a SPARCstation IPX complete with 19” CRT monitor, keyboard and mouse. Hence use tended to be limited to specialist applications and the one that I used around this time was employed in mobile data network conformance testing.
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