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We formulate charge transfer model for a single doped spin ladder, relevantfor the intrinsically doped plane of coupled spin ladders inSr$_{3}$Ca$_{11}$Cu$_{24}$O$_{41}$. Assuming the presence of the experimentallyobserved charge order in the system we solve the model using Hartree-Fockapproximation. Our results show the profound stability of the Zhang-Ricesinglets with respect to other configurations of doped holes, in agreement withrecent x-ray absorption measurements.Comment: 5 pages, 3 figures; to appear in: Lectures on the Physics of Highly  Correlated Electron Systems XI, AIP (2007

Doped Spin Ladder: Zhang-Rice Singlets or Rung-centred Holes?