https://philosophy-science-humanities-controversies.com/listview-details.php?id=197773&a=t&first_name=%20E.&author=Tugendhat&concept=Abstractness
E. Tugendhat on Abstractness - Dictionary of Arguments
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https://philosophy-science-humanities-controversies.com/listview-details.php?id=754695&a=t&first_name=Steven%20E.&author=Boer&concept=Abstractness
Steven E. Boer on Abstractness - Dictionary of Arguments
stevenboerabstractnessdictionaryarguments