TY  - RPRT
TI  - Learning the parts of objects by non-negative matrix factorization.
AU  - D D Lee
AU  - H S Seung
PY  - 1999
DO  - 10.1038/44565
UR  - https://pubmed.ncbi.nlm.nih.gov/10548103/
ID  - 10548103
ER  -