G. A. Hill

AN INTERNATIONAL PLAN FOR THE FUTURE STUDY OF THE VARIATION OF LATITUDE.

G. A. Hill, 1900, Science.

Comparing event flows— The New York Times and The Times of London: Conceptual Issues And Case Studies†

P. Fenn, G. A. Hill, 1974 .

The Management and Analysis of International Event Data: A Computerized System for Monitoring and Projecting Event Flows.

Charles A. McClelland, Rodney G. Tomlinson, Ronald G. Sherwin, 1971 .