You may also wish to search for items by Zigler, S. and Zigler.
Only one matching reference was found.
Stevenson, G.R.; Zigler, S.S., Relative thermodynamic stabilities of 1,6-methanoannulene, dinorcaradiene, and the 1,6-methanoannulene anion radical, J. Phys. Chem., 1983, 87, 895-898. [all data]