Zeng, Z, Jakupi, A; Bigelow, T; Grigg, R.B.; Kringstad, J; Belobraydic, M; and Zhou, X.: “Laboratory Observation of CO2 Phase Transition Induced Seismic Velocity Change,” paper ARMA 03-329 presented at the 42nd SU Rock Mechanics Symposium and 2nd US-Canada Rock mechanics Symposium, San Fransisco, 29 June- 2 July 2008.
Grigg, R.B.: "Technology Hold Key to Improving Recovery Efficiency," The American Oil & Gas Reporter, February 2007, 106.