1. Balestra, C., Germonpre, P., Marroni, A., Cronje, F.J.: PFO & the diver. Best Publishing Company, Flagstaff (2007)
2. Blatteau, J.E., Souraud, J.B., Gempp, E., Boussuges, A.: Gas nuclei, their origin, and their role in bubble formation. Aviat Space Environ. Med. 77, 1068–1076 (2006)
3. Tufan, K., Ademoglu, A., Kurtaran, E., Yildiz, G., Aydin, S., Egi, S.M.: Automatic detection of bubbles in the subclavian vein using doppler ultrasound signals. Aviat Space Environ. Med. 77, 957–962 (2006)
4. Nakamura, H., Inoue, Y., Kudo, T., Kurihara, N., Sugano, N., Iwai, T.: Detection of venous emboli using doppler ultrasound. European Journal of Vascular & Endovascular Surgery 35, 96–101 (2008)
5. Eftedal, O., Brubakk, A.O.: Agreement between trained and untrained observers in grading intravascular bubble signals in ultrasonic images. Undersea Hyperb. Med. 24, 293–299 (1997)