@article {On1970,
title = {On Rate of Change Per Cent Per Annum Over a Period of Years },
year = {1970},
url = {https://www.esri.ie/publications/on-rate-of-change-per-cent-per-annum-over-a-period-of-years},
author = {Geary, Roy C},
journal = {Memorandum Series 66a},
}