Columbia subject headings:
Astronautics--Optical communication systems--Congresses.
Laser communication systems--Congresses.
Pattern recognition systems--Congresses.
Harvard subject headings:
Astronautics--Optical communication systems--Congresses
Laser communication systems--Congresses.
Princeton subject headings:
Astronautics--Optical communication systems--Congresses.
Laser communication systems--Congresses.
Pattern recognition systems--Congresses.