Selected Reprints from Professor Rosenkrantz’s Seminal Contributions.- Matrix Equations and Normal Forms for Context-Free Grammars.- Attributed Translations.- An analysis of several heuristics for the traveling salesman problem.- System Level Concurrency Control for Distributed Database Systems.- Consistency and serializability in concurrent database systems.- An efficient method for representing and transmitting message patterns on multiprocessor interconnection networks.- Representability of Design Objects by Ancestor-Controlled Hierarchical Specifications.- The Complexity of Processing Hierarchical Specifications.- Approximation Algorithms for Degree-Constrained Minimum-Cost Network-Design Problems.- Efficient Algorithms for Segmentation of Item-Set Time Series.- Contributed Articles.- Sums-of-Products and Subproblem Independence.- An Optimistic Concurrency Control Protocol for Replicated Databases.- SNAPSHOT Isolation: Why Do Some People Call it SERIALIZABLE?.- A Richer Understanding of the Complexity of Election Systems.- Fully Dynamic Bin Packing.- Online Job Admission.- A Survey of Graph Algorithms Under Extended Streaming Models of Computation.- Interactions among human behavior, social networks, and societal infrastructures: A Case Study in Computational Epidemiology.