8JIANG,Q.,BUTLER,R.M.,and YEE,C.,Development of Steamand Gas Push (SAGP) Process; paper 059,7th UNITAR International Conference on Heavy Crude and Tar Sands,Beijing, China,1998, 23-31.
9JIANG, Q., BUTLER, R.M., and YEE, C.-T., Steam and Gas Push (SAGP) --2;paper 98-143, presented at the 49th Annual Thenical Meeting of the Petroleum Society Calgary, AB, 1998, (7) : 8-10.