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Have you read Garfield’s two-part essay on Ranganathan, published in Current Contents in 1984?  

Garfield said:

"A partial indicator of Ranganathan’s international impact is the number of citations to his work in Science Citation Index (SCI ) and Social Sciences Citation Index (SSC1 ). Over 400 publications cited his work over a 20-year period, Prolegomena to Library Classification, his comprehensive work on classification theory, is his most-cited publication. But, for a number of reasons, these citations are only a fraction of what a thorough search would establish. Not the least of three reasons is that our coverage in the field in the early days of SCI and SSC1 was rather selective and limited. Still, when compared to other library notables, it is remarkable how often Ranganathan’s work is cited, Indeed, when I began my recent talk at the Madras University library, I was moved to tell the audience that Ranganathan is to library science what Einstein is to physics."

https://garfield.library.upenn.edu/essays/v7p037y1984.pdf (Part 1)

https://garfield.library.upenn.edu/essays/v7p045y1984.pdf (Part 2)