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Literature analysis of P. vulgaris using WOS and BIOSIS Previews. P. vulgaris as a key word was searched in both WOS and BIOSIS Previews. The identified research articles were categorized by research direction and country using the HistCite. P. vulgaris related articles in WOS are classified by either research direction (A) or by country (B); whereas P. vulgaris related articles in BIOSIS Previews are presented in C and D, respectively.
