@TechReport{vdH:skewcompl,
  author = 	 {J. van der Hoeven},
  title = 	 {On the complexity of skew arithmetic},
  institution =  {HAL},
  year = 	 {2011},
  note = 	 {\verb|http://hal.archives-ouvertes.fr/hal-00557750/fr/|}
}