_:b667743477 . _:b667743480 . _:b667743479 . _:b667743479 . _:b667743478 . _:b667743479 _:b667743480 . _:b667743480 "Dan Brickley" . _:b667743477 _:b667743478 . _:b667743480 . _:b667743477 _:b667743479 . _:b667743478 . _:b667743478 "Ramanathan V. Guha" .