Analysis of information sources in references of the Wikipedia article "1893 Queensland colonial election" in English language version.
The contingent vote … was used in Queensland from 1892 to 1942 and for Democratic primary elections in the U.S. state of Alabama between 1915 and 1931. It has been used for presidential elections in Sri Lanka since 1978 and in 1996 … the United Kingdom … called it the 'supplementary vote'.