The following publications are possibly variants of this publication: 
- Adaptive Nonlinear Tracking Control of Kinematically Redundant Robot Manipulators with Sub-Task ExtensionsEnver Tatlicioglu, Michael L. McIntyre, Darren M. Dawson, Ian D. Walker. cdc 2005: 4373-4378 [doi] 
- Dynamic control of flexible, kinematically redundant robot manipulatorsLuong A. Nguyen, Ian D. Walker, Rui J. P. deFigueiredo. trob, 8(6):759-767, 1992.  [doi] 
- On null-space control of kinematically redundant robot manipulatorsKamil Cetin, Enver Tatlicioglu, Erkan Zergeroglu. eucc 2016: 678-683 [doi]