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Network of clavulanic acid studies by Streptomyces clavuligerus in the period of 1975–2017. (a) Research-topic map for publications about clavulanic acid production by Streptomyces clavuligerus. (b) Research-topic map with time overlay (2002–2008) for studies on clavulanic acid production by Streptomyces clavuligerus.
