Safran C, Porter D, Rury CD, Herrmann FR, Lightfoot J, Underhill LH, Bleich HL, SLACK WV.  1990.  ClinQuery: searching a large clinical database.. MD Comput. 7(3):144-53.

Safran C, Porter D, Lightfoot J, Rury CD, Underhill LH, Bleich HL, SLACK WV.  1989.  ClinQuery: a system for online searching of data in a teaching hospital.. Ann Intern Med. 111(9):751-6.

Porter D, Wigton RS, Reidelbach MA, Bleich HL, SLACK WV.  1988.  Self-service computerized bibliographic retrieval: a comparison of Colleague and PaperChase, programs that search the MEDLINE data base.. Comput Biomed Res. 21(5):488-501.

Ryan P, Winand D, Bleich HL, SLACK WV, Porter D.  1987.  Computer searching of the medical literature.. Ann Intern Med. 106(1):168-9.

Safran C, Porter D, SLACK WV, Bleich HL.  1987.  Diagnosis-related groups. A critical assessment of the provision for comorbidity.. Med Care. 25(10):1011-4.

Leeming BW, Porter D, Jackson JD, Bleich HL, Simon M.  1981.  Computerized radiologic reporting with voice data-entry.. Radiology. 138(3):585-8.

Fisher LA, Johnson TS, Porter D, Bleich HL, SLACK WV.  1977.  Collection of a clean voided urine specimen: a comparison among spoken, written, and computer-based instructions.. Am J Public Health. 67(7):640-4.