求助两篇文章，大家帮忙啊，多谢：）

1. Title: Determinants of bid-asked spreads in the over-the-counter market

Author: Benston, G. J.
            Hagerman, R. L.

 1974  Journal of Financial Economics

2. Title: Stock index futures arbitrage: International evidence

Author: Pradeep K. Yadav, Peter F. Pope

1990  INTERNATIONAL LIBRARY OF CRITICAL WRITINGS IN ECONOMICS

因为时间和杂志的知名度原因，总是找不到，希望各位帮忙，多谢：）