Oort's limit and the mass density in the disk:  Selected references	Ay 124
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The classics:

    Oort, J. 1960, B.A.N. 15, 494.  

    Oort, J. 1932, B.A.N. 6 (#238), 249.

    Oort, J. 1965, in SSS vol. V, "Galactic Structure", eds. Blaauw & Schmidt,
        p. 467.  Chicago: U. of Chicago Press.  [A good, short summary]

The recent work:

    Krisciunas, K., 1977, A.J., 82, 195.

    Hill, G., Hilditch, R.W., & Barnes, J.V., 1979, M.N.R.A.S., 186, 813.

    King, I.R. 1983, in "Kinematics, Dynamics and Structure of the Milky Way",
        W.L.H. Shuter (ed.), p. 53.  Dordrecht: Reidel.  [A cautionary note]

    Stromgren, B. 1985, in "The Milky Way Galaxy" (IAU 106), eds. Van Woerden 
        et al., p. 153.  Dordrecht: Reidel.

    Bahcall, J.N., 1984, Ap.J., 276, 169.  [F stars; an excellent summary]

    Bahcall, J.N., 1984, Ap.J., 287, 926.  [K giants]

    Gilden, D.L. & Bahcall, J.N., 1985, Ap.J., 296, 240.  [Uncertainities]

    Bahcall, J.N. 1987, in "Dark Matter in the Universe", eds. Kormendy & Knapp,
        p. 17.  Dordrecht: Reidel.  [A review of Bahcall's work]

    Kuijken, K., and Gilmore, G. 1989, M.N.R.A.S. 239, pp. 571, 605, and 651.
	[3 papers; probably the best modern work]

    Gilmore, G., Wyse, R.F.G., & Kuijken, K. 1988, in "Evoluationary Phenomena
        in Galaxies", Beckman and Pagel (eds.), p. 172.  (Dordrecht: Kluwer)

	(+ several other conference papers by the same crowd)

Some applications:

    Bahcall, J.N., Hut, P., & Tremaine, S. 1985, Ap.J., 290, 15-20.

    Bahcall, J.N., & Casertano, S. 1985, Ap.J., 293, L7.

The ISM contributions:

    Spitzer, L. 1978, in "Physical Processes in the Interstellar Medium", 
        p. 17.  New York: Willey & S.

    Knapp, G. 1987, P.A.S.P., 99, 1134.

    Kulkarni, S., and Heiles, C. 1987, in "Interstellar Processes", 
        eds. Hollenbach & Thronson, p. 87.