Factores (4) Technology (3) Research (3) Industrial productivity (3) Harbors (3) Estudio (3) Productividad (3) Tecnología (3) Investigación (3) Puertos (3) productivité (3) Data envelopment analysis (2) Labor (2) Technological innovations (2) Automated external defibrillation (2) Desfibrilación externa automática (2) Análisis envolvente de datos (2) Trabajo (2) Innovaciones tecnológicas (2) Longitud (2) frontière (2) Singapour (1) Manufacturing industries (1) Wages (1) Universities and colleges (1) Teaching (1) Sedimentation and deposition (1) Methodology (1) Measurement (1) Least squares (1)