↑ Brian Nesbitt (April 2001), "Intelligent Pump Units and Life Cycle Costs", World Pumps, 2001 (415): 20–25, doi:10.1016/S0262-1762(01)80135-8 Citation title of source Intelligent Pump Units and Life Cycle Costs date of source April 2001 author Brian Nesbitt journal World Pumps volume 2001 issue 415 pages 20–25 doi 10.1016/S0262-1762(01)80135-8 DOI 10.1016/S0262-1762(01)80135-8