Credits for the animations assembled here go to : Drs R Holcombe, M Jessel, P Bons, Prof D G De Paor (which is a copyrighted material), Stanford Univ. website, www.ScienceProf.com  site, Dr Girty's site www.sdsu.edu , UK Leeds www.leeds.ac.uk , Bristol Univ sites, www.virtualexplorer.com  site , Dr Pluijm, Dr G Mitra Rochester, isa.mich.edu  Univ site, Univ of Queensland, Vic, Australia, Dr Waldron, Dr Stockmal. For further information look at the page within this domain containing numerous sites. The reference to these links is the very acknowledgement of the fact that their work does not go unacknowledged.

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