Updated links to "Session Guarantees" paper.

readings.md

@@ -16,7 +16,7 @@ This list is neither sound (i.e., if something's listed here, that doesn't mean
 | Friday, 10/5     | Consistency models                           | Dev                 | Maurice P. Herlihy and Jeannette M. Wing, [Linearizability: A Correctness Condition for Concurrent Objects (TOPLAS 1990)](http://cs.brown.edu/~mph/HerlihyW90/p463-herlihy.pdf)
 | Monday, 10/8     | Consistency models                           | Natasha             | Mustaque Ahamad et al., [Causal memory: definitions, implementation, and programming (Distributed Computing, 1995)](https://link.springer.com/article/10.1007/BF01784241) ([off-campus access link (requires CruzID Gold login)](https://link-springer-com.oca.ucsc.edu/content/pdf/10.1007%2FBF01784241.pdf))
 | Wednesday, 10/10 | Consistency models                           | Abhishek            | Leslie Lamport, [Time, Clocks, and the Ordering of Events in a Distributed System (1978)](https://lamport.azurewebsites.net/pubs/time-clocks.pdf)
-| Friday, 10/12    | Consistency models                           | Austen              | Douglas B. Terry et al., [Session Guarantees for Weakly Consistent Distributed Data (PDIS '94)](https://dl.acm.org/citation.cfm?id=645792.668302)
+| Friday, 10/12    | Consistency models                           | Austen              | Douglas B. Terry et al., [Session Guarantees for Weakly Consistent Distributed Data (PDIS '94)](https://ieeexplore.ieee.org/document/331722) ([off-campus access link (requires CruzID Gold login)](https://ieeexplore-ieee-org.oca.ucsc.edu/document/331722))
 | Monday, 10/15    | Consistency models                           | Abhishek            | Wyatt Lloyd et al., [Don't Settle for Eventual: Scalable Causal Consistency for Wide-Area Storage with COPS (SOSP '11)](https://www.cs.cmu.edu/~dga/papers/cops-sosp2011.pdf)
 | Wednesday, 10/17 | Consistency models                           | [unclaimed]         | Paolo Viotti and Marko Vukolić, [Consistency in Non-Transactional Distributed Storage Systems (ACM Computing Surveys, 2016)](https://dl.acm.org/citation.cfm?id=2926965) (see also: [author's version](http://www.vukolic.com/consistency-survey.pdf); [version on arXiv](https://arxiv.org/abs/1512.00168); cf. [the Jepsen overview of consistency models](https://jepsen.io/consistency))
 | Friday, 10/19    | Replicated data types                        | Sohum               | Marc Shapiro et al., [Conflict-free Replicated Data Types (2011)](https://hal.inria.fr/inria-00609399/document)