@article {Estimation1968,
title = {Estimation of Quarterly Aggregates of GNP 1961-66},
year = {1968},
url = {https://www.esri.ie/publications/estimation-of-quarterly-aggregates-of-gnp-1961-66},
author = {Geary, R., and O'Donoghue, T.},
journal = {Memorandum Series 56},
}