@article{10_21136_AM_1980_103881,
     author = {Wimmer, Gejza},
     title = {On equivalence problem in linear regression models. {II.} {Unbiased} estimation of the covariance matrix scalar factor},
     journal = {Applications of Mathematics},
     pages = {423--431},
     publisher = {mathdoc},
     volume = {25},
     number = {6},
     year = {1980},
     doi = {10.21136/AM.1980.103881},
     mrnumber = {0596849},
     zbl = {0483.62055},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1980.103881/}
}