A study of international airline code sharingUnited States. Department of Transportation. Office of Aviation and International Economics, Gellman Research Associates · First published 1994Open the Tome
Analysis of competition in, and profile of, the FBO industryGellman Research Associates. · First published 1979Open the Tome
The role of scientific and technical information in critical period managementGellman Research Associates. · First published 1977Open the Tome
The role and application of scientific and technical information in the process of innovationGellman Research Associates, inc. · First published 1975Open the Tome
