Contributions to Operations Research

On Using the Linear Programming Relaxation of Assignment Type Mixed Integer Problems.- Contributions to Duality Theory of Certain Non-Convex Optimization Problems.- Multistate Reliability Problems for GSP-Digraphs.- Improved Bounds for the Sn /n Problem.- Selection of Solutions by Algorithms.- to Stochastic Scheduling Problems.- Aspects of Optimization in Automobile Insurance.- GERT Networks with Tree Structure: Properties, Temporal Analysis, Cost Minimization and Scheduling.- On Stability of Linear Time-Varying Infinite Dimensional Systems.- Optimal Stopping and Leavable Gambling Models with the Average Return Criterion.- A Closed Network Model. for I/O Subsystems.