The Intraday Behavior of Bid-Ask Spreads for NYSE Stocks and CBOE Options
Kalok Chan, Y. Peter Chung, Herb Johnson, The Intraday Behavior of Bid-Ask Spreads for NYSE Stocks and CBOE Options, The Journal of Financial and Quantitative Analysis, Vol. 30, No. 3 (Sep., 1995), pp. 329-346