If you are (or not) happy with the Stack-Of-Tasks and want to cite it, please use the following citation:
@inproceedings {mansard:icar:09,
title = {A Versatile Generalized Inverted Kinematics Implementation for Collaborative Working Humanoid Robots: The Stack of Tasks},
booktitle = {International Conference on Advanced Robotics (ICAR)},
year = {2009},
month = {June},
pages = {119},
url = {http://hal-lirmm.ccsd.cnrs.fr/file/index/docid/796736/filename/2009_icar_mansard-Stack_of_Tasks.pdf},
author = {N. Mansard and O. Stasse and P. Evrard and A. Kheddar}
}