Steady-State biodiesel blend estimation via a wideband oxygen sensor. - David B. Snyder; Elena G. Washington; Armando P. Indrajuana; Gregory M. Shaver (ACC, 2008)

Dynamic exhaust oxygen based biodiesel blend estimation with an Extended Kalman Filter. - David B. Snyder; Gayatri H. Adi; Michael P. Bunce; Carrie M. Hall; Gregory M. Shaver (ACC, 2010)