bibentry(
	bibtype     = "Unpublished",
	title       = "Efficient Estimation of Bid-Ask Spreads from Open, High, Low, and Close Prices", 
	year        = 2021,
	author      = as.person("David Ardia [aut], Emanuele Guidotti [aut], Tim A. Kroencke [aut]"),
    note        = "Available at SSRN",
    url         = "https://www.ssrn.com/abstract=3892335",
	textVersion = 'Ardia, David and Guidotti, Emanuele and Kroencke, Tim Alexander, "Efficient Estimation of Bid-Ask Spreads from Open, High, Low, and Close Prices". Available at SSRN: https://www.ssrn.com/abstract=3892335'
)
