Keynotes -- Algorithmic Challenges in Web Search Engines -- RNA Molecules: Glimpses Through an Algorithmic Lens -- Squares -- Matching Based Augmentations for Approximating Connectivity Problems -- Modelling Errors and Recovery for Communication -- Lossless Data Compression Via Error Correction -- The Power and Weakness of Randomness in Computation -- Regular Contributions -- A New GCD Algorithm for Quadratic Number Rings with Unique Factorization -- On Clusters in Markov Chains -- An Architecture for Provably Secure Computation -- Scoring Matrices That Induce Metrics on Sequences -- Data Structures for Halfplane Proximity Queries and Incremental Voronoi Diagrams -- The Complexity of Diffuse Reflections in a Simple Polygon -- Counting Proportions of Sets: Expressive Power with Almost Order -- Efficient Approximate Dictionary Look-Up for Long Words over Small Alphabets -- Relations Among Notions of Security for Identity Based Encryption Schemes -- Optimally Adaptive Integration of Univariate Lipschitz Functions -- Classical Computability and Fuzzy Turing Machines -- An Optimal Algorithm for the Continuous/Discrete Weighted 2-Center Problem in Trees -- An Algorithm for a Generalized Maximum Subsequence Problem -- Random Bichromatic Matchings -- Eliminating Cycles in the Discrete Torus -- On Behalf of the Seller and Society: Bicriteria Mechanisms for Unit-Demand Auctions -- Pattern Matching Statistics on Correlated Sources -- Robust Model-Checking of Linear-Time Properties in Timed Automata -- The Computational Complexity of the Parallel Knock-Out Problem -- Reconfigurations in Graphs and Grids -- -Varieties, Actions and Wreath Product -- Local Construction of Planar Spanners in Unit Disk Graphs with Irregular Transmission Ranges -- An Efficient Approximation Algorithm for Point Pattern Matching Under Noise -- Oblivious Medians Via Online Bidding -- Efficient Computation of the Relative Entropy of Probabilistic Automata -- A Parallel Algorithm for Finding All Successive Minimal Maximum Subsequences -- De Dictionariis Dynamicis Pauco Spatio Utentibus -- Customized Newspaper Broadcast: Data Broadcast with Dependencies -- On Minimum k-Modal Partitions of Permutations -- Two Birds with One Stone: The Best of Branchwidth and Treewidth with One Algorithm -- Maximizing Throughput in Queueing Networks with Limited Flexibility -- Network Flow Spanners -- Finding All Minimal Infrequent Multi-dimensional Intervals -- Cut Problems in Graphs with a Budget Constraint -- Lower Bounds for Clear Transmissions in Radio Networks -- Asynchronous Behavior of Double-Quiescent Elementary Cellular Automata -- Lower Bounds for Geometric Diameter Problems -- Connected Treewidth and Connected Graph Searching -- A Faster Algorithm for Finding Maximum Independent Sets in Sparse Graphs -- The Committee Decision Problem -- Common Deadline Lazy Bureaucrat Scheduling Revisited -- Approximate Sorting -- Stochastic Covering and Adaptivity -- Algorithms for Modular Counting of Roots of Multivariate Polynomials -- Hardness Amplification Via Space-Efficient Direct Products -- The Online Freeze-Tag Problem -- I/O-Efficient Algorithms on Near-Planar Graphs -- Minimal Split Completions of Graphs -- Design and Analysis of Online Batching Systems -- Competitive Analysis of Scheduling Algorithms for Aggregated Links -- A 4-Approximation Algorithm for Guarding 1.5-Dimensional Terrains -- On Sampling in Higher-Dimensional Peer-to-Peer Systems -- Mobile Agent Rendezvous in a Synchronous Torus -- Randomly Colouring Graphs with Girth Five and Large Maximum Degree -- Packing Dicycle Covers in Planar Graphs with No K 5–e Minor -- Sharp Estimates for the Main Parameters of the Euclid Algorithm -- Position-Restricted Substring Searching -- Rectilinear Approximation of a Set of Points in the Plane -- The Branch-Width of Circular-Arc Graphs -- Minimal Eulerian Circuit in a Labeled Digraph -- Speeding up Approximation Algorithms for NP-Hard Spanning Forest Problems by Multi-objective Optimization -- RISOTTO: Fast Extraction of Motifs with Mismatches -- Minimum Cost Source Location Problems with Flow Requirements -- Exponential Lower Bounds on the Space Complexity of OBDD-Based Graph Algorithms -- Constructions of Approximately Mutually Unbiased Bases -- Improved Exponential-Time Algorithms for Treewidth and Minimum Fill-In.