1. Akesson A, Forsberg L, Hederström E, Wollheim E. Ultrasound examination of skin thickness in patients with progressive systemic sclerosis (scleroderma). Acta Radiol Diagn. 1986;27:91–4.
2. Alexander H, Miller DL. Determining skin thickness with pulsed ultrasound. J Invest Dermatol. 1979;72:17–9.
3. Altmeyer P, Hoffmann K, Stücker M, Goertz S, el-Gammal S, Altmeyer P, Hoffmann K, Stücker M, Goertz S, el-Gammal S, et al. General phenomena of ultrasound in dermatology. In: Altmeyer P, Altmeyer P, el-Gammal S, Hoffmann K, editors. Ultrasound in dermatology. Berlin/Heidelberg/New York: Springer; 1992. p. 55–79.
4. Beck JS, Speace VA, Lowe JG, Gibbs JH. Measurement of skin swelling in the tuberculin test by ultrasonography. J Immunol Methods. 1986;86:125–30.
5. Beyer D, Peters PE, Friedmann G. Leistungsbreite der Real-time-Sonographie bei Lymphknotenerkrankungen. Rontgenpraxis. 1982;35:393–402.