[1]
Jacob Palme. Electronic Mail. Artech House Publishers, updated edition, 1995. Updates available online: http://www.dsv.su.se/~jpalme/e-mail-book/additions.html, October 1999.
[2]
Xindong Wu, Sita Ramakrishnan, and Heinz Schmidt. Knowledge objects. Informatica, 19(4):557–571, 1995.
[3]
Xindong Wu. SIKT: A structured interactive knowledge transfer program. In Proceedings of the 8th International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert Systems, June 1995.
[1]
Jacob Palme. Electronic Mail. Artech House Publishers, updated edition, 1995. Updates available online: http://www.dsv.su.se/~jpalme/e-mail-book/additions.html, October 1999.

[2]
Xindong Wu, Sita Ramakrishnan, and Heinz Schmidt. Knowledge objects. Informatica, 19(4):557–571, 1995.

[3]
Xindong Wu. SIKT: A structured interactive knowledge transfer program. In Proceedings of the 8th International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert Systems, June 1995.