The $l_q$ consistency of the Dantzig Selector for Cox's Proportional   Hazards Model
  The Dantzig selector for the proportional hazards model proposed by D.R. Cox is studied in a high-dimensional and sparse setting. We prove the $l_q$ consistency for all $q \geq 1$ of some estimators based on the compatibility factor, the weak cone invertibility factor, and the restricted eigenvalue for certain deterministic matrix which approximates the Hessian matrix of log partial likelihood. Our matrix conditions for these three factors are weaker than those of previous researches. 
Kou Fujimori and Yoichi Nishiyama
math.ST math.PR stat.TH