John R. Callahan

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Callahan, John R., Khatsuriya, Reshma R., Hefner, Randy (1998): Web-Based Issue Tracking for Large Software-Projects. In IEEE Internet Computing, 2 (5) pp. 25-33.

Purtilo, James M., Callahan, John R. (1989): Parse Tree Annotations. In Communications of the ACM, 32 (12) pp. 1467-1477.

Easterbrook, Steve M., Callahan, John R. (1997): Formal Methods for V&V of Partial Specifications: An Experience RSeport. In: 3rd IEEE International Symposium on Requirements Engineering RE97 January 5-8, 1997, Annapolis, MD, USA. pp. 160-168.

Schneider, Francis, Easterbrook, Steve M., Callahan, John R., Holzmann, Gerard J. (1998): Validating Requirements for Fault Tolerant Systems using Model Checking. In: 3rd International Conference on Requirements Engineering ICRE 98, Putting Requirements Engineering to Practice, April 6-10, 1998, Colorado Springs, CO, USA, Proceedings , 1998, . pp. 4-13.