Analysis of information sources in references of the Wikipedia article "Brihaspati" in English language version.
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: CS1 maint: multiple names: authors list (link)Quote: These atheistical doctrines existed from the earliest times as their traces are visible even in the Rigveda in some hymns of which Prof Max Muller pointed out the curious traces of an incipient scepticism. (...) Two things are therefore clear that the Brihaspatya tenets also called Charvaka tenets are of a very old standing..."