The relationship between ___ and ___ was established in YEAR by AUTHOR .
The link between ___ and ___ was established in YEAR by AUTHOR .
The connection between ___ and ___ was established in YEAR by AUTHOR .
The association between ___ and ___ was established in YEAR by AUTHOR .
The association between ___ and ___ was not shown until YEAR .
The association between ___ and ___ was not demonstrated until YEAR .
Prior to the study of AUTHOR ( YEAR ) , the role of ___ was mostly obscure .
Prior to the work of AUTHOR ( YEAR ) , the role of ___ was largely unknown .
Before YEAR , the ___ had got only cursory attention from historians .
Before YEAR , the ___ had received only cursory attention from historians .
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