Neal, C. S., and D. Havelka. “Balancing Competing Interests: Managing And Regulating Spam While Preserving The Availability Of E-Mail For Ethical Commerical Users”. Review of Business Information Systems (RBIS), vol. 10, no. 2, Apr. 2006, pp. 1-6, doi:10.19030/rbis.v10i2.5317.