Once I replace a party member, can I ever get him back?

This is coming entirely from my memory, so please forgive me for any mistakes:

Most party members will stay where you put them (or if you say 'No' to them when they want to join). There are a number of exceptions though:

• If you remove Kivan, he stays gone for good.
• If you remove Shar-Teel, she stays gone for good.
• If you say 'No' to Jaheira and Khalid the first time, you can never get them again.
• Furthermore, if you kick out one of them, the other goes as well.
• If you say 'No' to Edwin with Dynaheir in your party, you can never get him again.
• If you say 'No' to Viconia the first time, you can never get her again.
• The same goes for Branwen and Yeslick
• If you make Xan leave by being rude, he's also gone forever.

Basically, whenever a party member leaves beacuse of arguments or disagreements they are gone for good.