Good academic papers on hip hop sampling/sampling or quoting in African American culture?

Here's one I've always hated with a purple passion (but you might like it):

Goodwin, Andrew. “Sample and Hold: Pop Music in the Digital Age of Reproduction.” On Record: Rock, Pop and the Written Word. Ed. Simon Frith and Andrew Goodwin. New York: Pantheon, 1990. 258-73.

My MA thesis was about John Leland, the Singles critic for Spin 1985-1989. I focused on his GENIUS piece "Temporary Music" which centers on the "Ashley's Roachclip" sample in Milli Vanilli's "Girl You Know It's True." But it only makes up a small portion of the thesis overall. Still, if you want a copy, let me know.

Well, I'm tossing off a particularly ham-handed paper about evaluating authorship in hip hop through the rubric of oral culture, using Schloss, Cheryl Keyes' Rap Music and Street Consciousness, Walter Ong's Orality and Literacy... along with:

Marshall, Wayne
Giving up Hip-Hop's Firstborn: A Quest for the Real after the Death of Sampling
Callaloo - Volume 29, Number 3, Summer 2006, pp. 868-892 - Article

Social Context and Musical Content of Rap Music, 1979-1995
Jennifer C. Lena