1. TRIBON Solutions. http://www.tribon.com/corporate/home.asp.
2. Intergraph. http://ppo.intergraph.com/marine.
3. Cadmatic OY. http://www.cadmatic.com.
4. SENER Engineering Group. http://www.foransystem.com.
5. A study on the data structure and implementation techniques for the object oriented ship structure modeling;Suh;Transactions of the Society of Naval Architects of Korea,1994