@article{lin30190,
    title   = {Sphingomonas aurantiaca sp. nov., Sphingomonas aerolata sp. nov. and Sphingomonas faeni sp. nov., air- and dustborne and Antarctic, orange-pigmented, psychrotolerant bacteria, and emended description of the genus Sphingomonas.},    
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    year    = {2003},    
    doi     = {10.1099/ijs.0.02461-0},    
    pmid    = {13130003}        
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    @article{lin239946,
    title   = {Markerless gene deletion system for sphingomonads.},    
    author  = {Kaczmarczyk A, Vorholt JA, Francez-Charlot A.},    
    journal = {Appl Environ Microbiol},    
    year    = {2012},    
    doi     = {10.1128/aem.07347-11},    
    pmid    = {22427496}        
    }