Barndorff Nielsen, OCox, D R2012-05-142012-05-141979Journal of the royal statistical society,Series B,V41,3,P279-312http://hdl.handle.net/10263/4001enAsymptotic expansionCircular normal distributionconditional inferenceConditional maximum likelihoodEdgeworth seriesMaximum likelihood ratio testEdgeworth and saddle-point approximations with statistical applicationsArticle