2009: 237. ISBN 978-0-07-352632-4. Kathy Hayes; Semoon Chang. The RelativeEfficiency of City Manager and Mayor–Council Forms of Government. Southern Economic
Wilamowski, Piotr Milart, Mariusz Galek, Roman Popielarz. Relative sensitization efficiency of fluorescent probes/sensitizers for monitoring and acceleration
JSTOR 1369067. doi:10.2307/1369067. Carlisle, J. D.; Holberton, R. L. RelativeEfficiency of Fecal versus Regurgitated Samples for Assessing Diet and the Deleterious
Overland, Indra. Natural gas and CO2 price variation: Impact on the relative cost-efficiency of LNG and pipelines. "International Journal of Environmental Studies"