@article {Burghardt23, author = {Galen Burghardt and Gerald A.. Hanweck, Jr}, title = {Calendar-Adjusted Volatilities}, volume = {1}, number = {2}, pages = {23--32}, year = {1993}, doi = {10.3905/jod.1993.407875}, publisher = {Institutional Investor Journals Umbrella}, issn = {1074-1240}, URL = {https://jod.pm-research.com/content/1/2/23}, eprint = {https://jod.pm-research.com/content/1/2/23.full.pdf}, journal = {The Journal of Derivatives} }