1Gardner C A,Edward E. Inbred maize line PH6JM, U S patent number 6,809,240 [ P]. Pioneer Hi - Bred International, Inc. , 2004.
2James Clive. Global status of commercialized biotech/GM crops: 2007 [ EB/OL]. ISAAA Brief No. 37,2007, ISAAA: Ithaca.
3Kaeppler S. Biotechnology : New Horizons [ A ]. In : Smith C W, Betran J, Runge E C A ( eds. ). Corn : Origin, History, Technology and Production[ M]. Published by John Wiley & Sons, Inc., Hoboken, New Jersey,2004,399 - 425.
4USDA. Year 2007 USDA Agricultural Production Report[ EB/ OL]. 2007.