@article{lin299903,
    title   = {Ecology and nature of immunoglobulin A1 protease-producing streptococci in the human oral cavity and pharynx.},    
    author  = {Kilian M, Holmgren K.},    
    journal = {Infect Immun},    
    year    = {1981},    
    doi     = {10.1128/iai.31.3.868-873.1981},    
    pmid    = {7014463}        
    }