Scenarios-an industrial case study and hypermedia enhancements. - Paul A. Gough; Filip T. Fodemski; Stewart A. Higgins; S. J. Ray (RE, 1995)

Managing Product Requirements for Medical IT Products. - Stewart A. Higgins; Maurice de Laat; Paul M. C. Gieles; Emilienne M. Geurts (RE, 2002)

Managing Requirements for Medical IT Products. - Stewart A. Higgins; Maurice de Laat; Paul M. C. Gieles; Emilienne M. Geurts (IEEE Softw., 2003)