TY  - JOUR
TI  - Efficient Estimation of a System of Regression Equations when Disturbances are Both Serially and Contemporaneously Correlated
AU  - Richard W. Parks
JO  - Journal of the American Statistical Association
PY  - 1967
VL  - 62
IS  - 318
DO  - 10.1080/01621459.1967.10482923
UR  - https://doi.org/10.1080/01621459.1967.10482923
ER  -