1. Goldberg BB, Gramiak R, Freimanis AK. Early history of diagnostic ultrasound: the role of American radiologists. AJR Am J Roentgenol. 1993;160(1):189–94.
2. Cohen HL, Moore WH. History of emergency ultrasound. J Ultrasound Med. 2004;23(4):451–8.
3. Hwang J-J, Quistgaard J, Souquet J, Crum LA. Portable ultrasound device for battlefield trauma. In: IEEE Proceedings. Ultrasonics symposium; 1998.
4. Kirkpatrick AW, Sirois M, Laupland KB, Goldstein L, Brown DR, Simons RK, et al. Prospective evaluation of hand-held focused abdominal sonography for trauma (FAST) in blunt abdominal trauma. Can J Surg. 2005;48(6):453–60.
5. Kirkpatrick AW, Simons RK, Brown DR, Ng AK, Nicolaou S. Digital hand-held sonography utilised for the focused assessment with sonography for trauma: a pilot study. Ann Acad Med Singapore. 2001;30(6):577–81.