Columbia subject headings:
Berko, Stephan--Congresses.
Energy-band theory of solids--Congresses.
Free electron theory of metals--Congresses.
Physicists--Romania--Biography--Congresses.
Positrons--Congresses.
Surfaces (Physics)--Congresses.
Harvard subject headings:
Berko, Stephan--Congresses.
Energy-band theory of solids--Congresses.
Free electron theory of metals--Congresses.
Physicists--Romania--Biography--Congresses.
Positrons--Congresses.
Surfaces (Physics)--Congresses.
Princeton subject headings:
Berko, Stephan--Congresses.
Energy-band theory of solids--Congresses.
Free electron theory of metals--Congresses.
Physicists--Romania--Biography--Congresses.
Positrons--Congresses.
Surfaces (Physics)--Congresses.