• The impedance cardiography device : patent applicationMärtens, Olev; Abdullayev, Anar; Metshein, Margus; Gautier, Antoine; Frappe, Antoine; Krivošei, Andrei; Rist, Marek; Annus, Paul; Larras, Benoit; John, Deepu; Cardiff, Barry2023 https://www1.epa.ee/patent/kirjeldus/P202200004.pdf https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=US&NR=2023320606A1&KC=A1&FT=D&ND=3&date=20231012&DB=&locale=en_EP