1. Lichtenstein D, Courret JP (1998) Feasibility of ultrasound in the helicopter. Intensive Care Med 24:1119
2. Lapostolle F, Petrovic T, Lenoir G, Catineau J, Galinski M, Metzger J, Chanzy E, Adnet F (2006) Usefulness of hand-held ultrasound devices in out-of-hospital diagnosis performed by emergency physicians. Am J Emerg Med 24:237–242
3. Lindelius A (2009) The role of surgeon-performed ultrasound in the management of the acute abdomen. PhD thesis, Karolinska Institute, Stockholm
4. Puylaert JBCM (1986) Acute appendicitis: ultrasound evaluation using graded compression. Radiology 158:355–360
5. Van Gansbeke D, Matos C, Askenasi R, Braude P, Tack D, Lalmand B, Avni EF (1989) Echographie abdominale en urgence, apports et limites. In: Réanimation et médecine d’urgence. Société de Réanimation de Langue Française. Expansion Scientifique Française, Paris, pp 36–53