Columbia subject headings:
Cancer--Chemotherapy--Congresses.
Nitrosoureas--Metabolism--Congresses.
Nitrosoureas--Testing--Congresses.
Nitrosoureas--Therapeutic use--Congresses.
Harvard subject headings:
Cancer--Chemotherapy--Congresses
Nitrosoureas--Metabolism--Congresses.
Nitrosoureas--Testing--Congresses.
Nitrosoureas--Therapeutic use--Congresses.
Princeton subject headings: