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1. Air-pressure, vocal folds vibration and acoustic characteristics of phonation during vocal exercising. Part 2. Measurement on a physical model

2. Chlorophyll fluorescence upper-to-lower-leaf ratio for determination of irrigation time for Pentas lanceolata

3. Development of photosynthetic electron transport reactions under the influence of phytohormones during greening of cotyledons of Brassica juncea

4. Intelligent human-machine voice communication system

8. Surface and subsurface flow in eucalyptus plantations in north-central Portugal

9. Toxic effects of high copper content on physiological processes in Pinus sylvestris L.