%0 Journal Article %A N'Guessan, Assi %T Constrained covariance matrix estimation in road accident modelling with Schur complements %J Comptes Rendus. Mathématique %D 2003 %P 219-222 %V 337 %N 3 %I Elsevier %U http://www.numdam.org/articles/10.1016/S1631-073X(03)00309-1/ %R 10.1016/S1631-073X(03)00309-1 %G en %F CRMATH_2003__337_3_219_0