APA   Click to copy
Chu, M. T., Diele, F., Plemmons, R., & Ragni, S. (2004). Optimality, computation, and interpretation of nonnegative matrix factorizations, 1–18.

Chicago/Turabian   Click to copy
Chu, M. T., F. Diele, R. Plemmons, and Stefania Ragni. “Optimality, Computation, and Interpretation of Nonnegative Matrix Factorizations” (December 1, 2004): 1–18.

MLA   Click to copy
Chu, M. T., et al. Optimality, Computation, and Interpretation of Nonnegative Matrix Factorizations. Dec. 2004, pp. 1–18.

@article{m2004a,
  title = {Optimality, computation, and interpretation of nonnegative matrix factorizations},
  year = {2004},
  month = dec,
  day = {1},
  pages = {1-18},
  author = {Chu, M. T. and Diele, F. and Plemmons, R. and Ragni, Stefania},
  month_numeric = {12}
}