Conditions for nonnegative independent component analysis. Plumbley, M. IEEE Signal Processing Letters, 9(6):177-180, 2002.
bibtex   
@Article{Plumbley_2002_8892,
  author = {Plumbley, M.D.},
 journal = {IEEE Signal Processing Letters},
 number = {6},
 pages = {177-180},
 title = {Conditions for nonnegative independent component analysis},
 volume = {9},
 year = {2002},
 title_with_no_special_chars = {Conditions for nonnegative independent component analysis}
}

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