1 “... the litera­ ture to the end of 1978. I decided to update this to the end of 1982 with a few key references...”

2 “... constructing supramolecules are weak, the supramolecular str- ture may vary depending on various factors...”

3 “... who is already quite well acquainted with the general litera­ ture. This has allowed us to dispense...”

4 “... O) ions doped as impurities in single crystal hosts.Using low tempera- 2 6 ture polarized optical...”