References [lJ S.L.Uppal, "Electrical power" ,Thirteenth edition, ppl33-159, inl988. [2] J. Guthrie Brown "Hydro-Electric Engineering practice", vol. 2 Mechanical & Electrical Engineering, second edition, pp85-121 , in 1970. [3] P.L.Ballaney, "Theory of Machines", tenth edition, pp 978-1032, in1979. [ 4 J R.M.Arston, "Electronic Engineering hand book" in 1992. j [5] http://www.plant-maintenance.com /index [Plant maintenance resource center] [6] http://www.vibrationresearch.com [Vibration Research Corporation, Michigan] [7] http://www.vib.com [VSC Vibration analysis] [8] http://www.vitech-apac.com/shop/ [DLI Engineering corporation] [91 http://www.vibinst.org/vibezonenew-tec.html [Vibration Institute] [ l 0] http://www.ieee.org/pubs/spectrum/9906/non.html [Publications] [Ill http://www.IAHRtemplate.htm "Stanislav Pejovic, trouble shooting of turbine vortex core resonance & air introduction into the draft tube" ... / tV& d .: !;: . ............__ ,., ~ .. , / 42