Columbia subject headings:
Energy policy--Canada--Mathematical models--Congresses.
Energy policy--Mathematical models--Congresses.
Energy policy--United States--Mathematical models--Congresses.
Harvard subject headings:
Energy policy--Canada--Mathematical models--Congresses.
Energy policy--Mathematical models--Congresses.
Energy policy--United States--Mathematical models--Congresses.
Princeton subject headings:
Energy policy--Canada--Mathematical models--Congresses.
Energy policy--Mathematical models--Congresses.
Energy policy--United States--Mathematical models--Congresses.