The Rate of Obsolescence of Technical Knowledge--A Note

The Economics of Industrial Innovation

2012 • 5,100 citations

Invention and Economic Growth

1966 • 3,119 citations

Invention, Growth and Welfare: A Theoretical Treatment of Technological Change.

1970 • 691 citations

Inventive Activity: Problems of Definition and Measurement

1962 • 108 citations

Research and Competitive Product Differentiation in the Pharmaceutical Industry in the United States

1964 • 67 citations

THE TREATMENT OF INTANGIBLE RESOURCES AS CAPITAL

1972 • 24 citations

Patent data as a guide to industrial activity

1973 • 22 citations

CHANGES IN THE QUALITY OF INVENTIVE OUTPUT AND PATENT BASED INDICES OF TECHNOLOGICAL CHANGE

1973 • 16 citations

Some Difficulties in Measuring Inventive Activity

1962 • 2 citations