Paper  bibtex   

@article{
 title = {Utilizing Wind Direction and Wind Speed as Independent Variables in Multilinear Receptor Modeling Studies},
 type = {article},
 year = {2000},
 keywords = {factor analysis,positive matrix factorization,receptor modeling,source apportionment},
 id = {29a02a3a-237e-3fed-95da-2a56ef908570},
 created = {2014-05-31T04:12:30.000Z},
 file_attached = {true},
 profile_id = {9edae5ec-3a23-3830-8934-2c27bef6ccbe},
 group_id = {63e349d6-2c70-3938-9e67-2f6483f6cbab},
 last_modified = {2014-11-19T06:01:47.000Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {false},
 hidden = {false},
 bibtype = {article},
 author = {Paatero, Pentti},
 number = {September}
}