., S. and ., S. 2012. SOME COMMENTS ON THE THEOREM PROVIDING STATIONARITY CONDITION FOR GSTAR MODELS IN THE PAPER BY BOROVKOVA et al. Journal of the Indonesian Mathematical Society. 13, 1 (Jul. 2012), 115–122. DOI:https://doi.org/10.22342/jims.13.1.90.115-122.