Columbia subject headings:
Antimetabolites--Congresses.
Antineoplastic agents--Congresses.
Antiviral agents--Congresses.
Nucleosides--Congresses.
Harvard subject headings:
Antimetabolites--Congresses.
Antineoplastic agents--Congresses
Antiviral agents--Congresses
Nucleosides--Congresses.
Princeton subject headings:
Antimetabolites--Congresses.
Antineoplastic agents--Congresses.
Antiviral agents--Congresses.
Nucleosides--Congresses.