Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) M. Papagianni and M. Mattey and B. Kristiansen,Citric acid production and morphology of Aspergillus niger as functions of the mixing intensity in a stirred tank and a tubular loop bioreactor,Biochemical Engineering Journal,1369-703X,Elsevier BV,1998-12,2,3,197-205,https://cir.nii.ac.jp/crid/1363388843968111488,https://doi.org/10.1016/s1369-703x(98)00032-1