Columbia subject headings:
Exciton theory--Congresses.
Ionic crystals--Congresses.
Polarons--Congresses.
Semiconductors--Congresses.
Harvard subject headings:
Exciton theory--Congresses.
Ionic crystals--Congresses.
Polarons--Congresses.
Semiconductors--Congresses.
Princeton subject headings:
Exciton theory--Congresses.
Ionic crystals--Congresses.
Polarons--Congresses.
Semiconductors--Congresses.