Mining for Graph-Based Library Usage Patterns in COBOL Systems - Opdebeeck, Ruben; Fabry, Johan; Molderez, Tim; De Bleser, Jonas; De Roover, Coen (2021 IEEE International Conference on Software Analysis, Evolution and Reengineering (SANER), Software Analysis, Evolution and Reengineering (SANER), 2021 IEEE International Conference on, SANER, 2021)