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 - [Context Aware Scanning for Parsing Extensible Languages](http://www.umsec.umn.edu/publications/Context-Aware-Scanning-Parsing-Extensible)
 - [Efficient and Flexible Incremental Parsing](http://ftp.cs.berkeley.edu/sggs/toplas-parsing.ps)
-- [Incremental Analysis of Real Programming Languages](https://dl.acm.org/citation.cfm?id=258920)
+- [Incremental Analysis of Real Programming Languages](https://pdfs.semanticscholar.org/ca69/018c29cc415820ed207d7e1d391e2da1656f.pdf)
 - [Error Detection and Recovery in LR Parsers](http://what-when-how.com/compiler-writing/bottom-up-parsing-compiler-writing-part-13)
 - [Error Recovery for LR Parsers](http://www.dtic.mil/dtic/tr/fulltext/u2/a043470.pdf)