Anacrotic "notch" on the upstroke of external carotid curve may indicate a critically high systolic pulmonary arterial pressure value / K. Szabó, G. Jokkel, R. Pick
  Bibliogr. 21 tétel, Abstr. eng.
  In: Acta Physiologica Hungarica. - ISSN 0231-424X. - 1991. 78. évf. 4. sz., p. 323-344.