In his seminal essay-turned-book On Bullshit,Frankfurt (2005) ... Other philosophers have since expanded on his work, most notably G. A. Cohen in his essay

In his seminal essay-turned-book On Bullshit,Frankfurt (2005) ... Other philosophers have since expanded on his work, most notably G. A. Cohen in his essay “Deeper into Bullshit”(Cohen 2002)... Time travel or me not understanding what those numbers mean ?