1. German Cipherboard RFG, "National Catalog of Criteria for the Evaluation of Trusted IT Systems-Draft, Version 1, 23. Sept. 1988 to be published in 1989
2. Girling, C.G., "Covert Channels in LAN's", IEEE Transactions on Software Engineering, Vol. SE-13, No.2, February 1987
3. Haigh, J.T., R.A. Kemmerer, J.Mc Hugh, and W.D. Young, "An Experience Using Two Covert Channel Analyses Techniques on a Real System Design", 1986 IEEE Symposium on Security and Privacy
4. IEEE Standard 802.2, "Logical Link Control", 1985
5. IEEE Standard 802.3, "Carrier Sense Multiple Access with Collision Detection", 1985