If anyone has access to these I would appreciate it...
A Practical Guide to the Comparative Case Study Method in Political Psychology
Juliet Kaarbo and Ryan K. Beasley
Political Psychology
Vol. 20, No. 2 (Jun., 1999), pp. 369-391
Cross-National Statistical Research and the Study of Comparative Politics
Robert W. Jackman
American Journal of Political Science
Vol. 29, No. 1 (Feb., 1985), pp. 161-182
Comparing and miscomparing
G Sartori
Journal of Theoretical Politics
July 1991 vol. 3 no. 3 243-257