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Authors ?Mattson, N.S. S.E. Burnett, B.A. Krug, and R.G. Lopez. Publication Greenhouse Grower 27(5):26?32.

Authors Hall, T.J., Dennis, J.H., R.G. Lopez, Krug, B.A. and S.E. Burnett. Publication Greenhouse Management and Production. 28 (12):27?28.

Authors Lopez, R.G., S.E. Burnett, B.A. Krug, and J.H. Dennis Publication Greenhouse Management and Production 28(11):26 ,28?29, 50.

Authors Yanik, K. Publication ?Sustainability_Purdue Research, October 2008