The thirty-year interval between historic bridge failures was first highlighted by the work of Paul Sibly, who wrote a thesis on the subject, and his University of London advisor, A. C. Walker.
Paul Sibly在其著作中首先提到了历史上每隔30年即有桥梁坍塌的事实，并就此题目撰写了一篇论文，Sibly在伦敦大学的导师A.