Genetic exchange among natural isolates of bacteria: recombination within the phoA gene of Escherichia coli.
DuBose RF, Dykhuizen DE, Hartl DL. Genetic exchange among natural isolates of bacteria: recombination within the phoA gene of Escherichia coli. Proc Natl Acad Sci U S A. 1988 Sep; 85(18):7036-40.