Bifacially worked core tools, which might be considered non-classic bifaces, also have been found.
Hyeong Woo Lee 2013, 'The Persistence of Mode 1 Technology in the Korean Late Paleolithic', PLoS ONE10.1371/journal.pone.0064999. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)