1. AIUM, American Institute of Ultrasound in Medicine, 1982. Standard methods for testing single-element pulse-echo ultrasonic transducers, Interim Standard, J. Ultrasound Med. 7, (Suppl. 1).
2. Haigis W, Buschmann W. 1985. Echo reference standards in ophthalmic ultrasonography, Ultrasound Med Biol 11: 149.
3. Haigis W. 1985, Performance measurements in ophthalmic ultrasonography with respect to IEC-recommendations. In: R W Gill M J Dadd (eds) WFUMB ’85, Proc. of the 4th Meet, of the World Fed. for Ultras, in Med. & Biol., Pergamon Press, Sidney, New York, p. 433.
4. Haigis W, Buschmann W. 1986. Frequenzmessungen an Schallköpfen zur Qualitätssicherung in der ophthalmologischen Ultraschalldia-gnostik. In: Ultraschalldiagnostik 85, O Schnaars (eds) G. Thieme Verlag, Stuttgart, p. 776.
5. Haigis W. 1987. Computer-assisted clinical A-mode analysis in ophthalmic ultrasonography. In: Ophthalmie echography, KC Ossoinig (ed) Doc. Ophth. Proc. Ser. 48, Martinus Nijhoff / Dr. W. Junk Publ., Dordrecht, p. 187.