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2. L'ecocontrastografia della vena cava inferiore;Gullace;G. Ital. Cardiol,1980
3. Evaluation of linear contrast echo on pulmonary valve echogram;Gullace,1980
4. Evaluation of contrast echo effect in inferior vena cava and pulmonary valve;Gullace;Excerpta Med,1981
5. Studio ecocardiografico ed ecocontrastografico della vena cava inferiore nei versamenti pericardici;Gullace,1981