@article{10_21136_AM_1989_104366,
     author = {And\v{e}l, Ji\v{r}{\'\i}},
     title = {Periodic autoregression with exogenous variables and periodic variances},
     journal = {Applications of Mathematics},
     pages = {387--395},
     publisher = {mathdoc},
     volume = {34},
     number = {5},
     year = {1989},
     doi = {10.21136/AM.1989.104366},
     mrnumber = {1014079},
     zbl = {0697.62084},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1989.104366/}
}