5[3]Reger E. Schechter: "Unfair Trade Practices and Interllectual property "( second and edition ), West publishing Co. St. Paul, Minn,1993, P160.
6[4]Robert C. Scheinfeld&Gary M. Butter. Using Trade Secret law to Protect computer Sofeware, V. 17, No. 2, Rutgers computer and Technology law of Journal, 1991 ,atP382.
7Accounting Horizons, June 1996.
8AICPA, Audit Issues in Revenue Recognition, February 1999.