TY - JOUR AU - Wimmer, Gejza TI - On equivalence problem in linear regression models. II. Unbiased estimation of the covariance matrix scalar factor JO - Applications of Mathematics PY - 1980 SP - 423 EP - 431 VL - 25 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/AM.1980.103881/ DO - 10.21136/AM.1980.103881 LA - en ID - 10_21136_AM_1980_103881 ER -