P. B. Borthakur

Expression, nucleotide sequence and mutational analysis of two open reading frames in the nif gene region of Anabaena sp. strain PCC 7120

R. Haselkorn, D. Borthakur, W. Buikema, 1990, Molecular and General Genetics MGG.

Nitrogen fixation in filamentous cyanobacteria

R. Haselkorn, D. Norris, D. Borthakur, 1991 .

Inactivation of patS and hetN causes lethal levels of heterocyst differentiation in the filamentous cyanobacterium Anabaena sp. PCC 7120

R. Haselkorn, S. Callahan, C. Orozco, 2005, Molecular microbiology.