中国科学院数学与系统科学研究院期刊网
Nonnegative Estimation of Variance Component Matrix in Multivariate Linear Mixed Model
Tie Feng MA, Ren Dao YE, Li Jie JIA
Acta Mathematica Sinica, Chinese Series . 2010, (2): 349 -362 .  DOI: 10.12386/A2010sxxb0042