Al-Kufaishi, S., S. Blackmore, H. Sourell, and G. Maletti (2005). Assessment of two variable rate irrigation controllers used on a centre pivot. Agr. Eng. Int.: the CIGR Ejournal. Manuscript LW 05 002. Vol. VII.
ASABE (2012). S436.1: Test procedure for determining the uniformity of water distribution of center pivot and lateral move irrigation machines equipped with spray or sprinkler nozzles. St. Joseph, MI: ASABE.
Evans, R. G., J. LaRue, K. C. Stone, and B.A. King (2013). Adoption of site-specific variable rate sprinkler irrigation systems. Pub. from USDA-ARS / UNL Fac. Paper 1245.
http://digitalcommons.unl.edu/usdaarsfacpub/1245 (accessed on March 2014).
Evans, R. G., J. LaRue, K. C. Stone, and B. A. King (2012). Adoption of site-specific variable rate sprinkler irrigation systems. Irrigation Science:1-17.
Fraser, T. (2011). Variable-rate irrigation. landcare research.
http://www.ourfuture.net.nz/Stories/122 (accessed on August 2013).
Hedley C., I. Yule, M. Tuohy, and I. Vogeler (2009). Key performance indicators for variable rate irrigation implementation on variable soils. St. Joseph, ASABE.
Hedley, C. B. and I. J. Yule (2009). Soil water status mapping and two variable‐rate irrigation scenarios. Precision Agriculture 10(4):342 ‐355.
Hezarjaribi, A., H. Sourell, and F-J. Bockisch (2008). Site-specific for subfields: Development of irrigation map and a dynamic control for center pivot. Landtechnik, volume 63(3), Pp: 154-155, in German.
Kikiras, P.C., and D. Drakoulis (2003). The European approach to augmented satellite based positioning systems and their application in precision farming, proceedings of the Int. Symp. at Volos, Greece, 7–9, Nov. 2003.
Konstantinos, K., X.Apostolos, K. Panagiotis, and S. George (2007). Topology optimization in wireless sensor networks for precision agriculture applications. Sensor Tec. and Apps. 2007. Int. Conf. on sensor Comm.: 526–530.
Liu X. and X. Li, (2013). Application of information technology for Precision agriculture. ASABE Ann. Int. Mtg. Spon. by ASABE Kansas City, Missouri July 21 – 24.
McCarthy, A.C., N.H. Hancock, and S.R. Raine (2010). VARIwise: A general-purpose adaptive control framework for spatially and temporally varied irrigation at sub-field level. Computers and Electronics in Agr., 70: 117-128.
Thörmann, H-H, K. Nolting, M. Kraft, and H. Sourell (2012). Possibilities of precision irrigation. Aquarius – Proj. report. Agr. chamber Lower Saxony District at Uelzen.: 101-119, in German.
Vellidis, G. 2005. A real-time smart sensor array for scheduling irrigation in cotton, NESPAL – Nat. Envi. Sound Prod. Agr. Lab.