Links
[1] https://www.researchgate.net/profile/Asen-Petrov-2
[2] https://www.ctsnet.org/user/login?destination=user/531082
[3] https://www.ctsnet.org/print/home/asen-petrov
[4] https://www.ctsnet.org/article/minimally-invasive-bentall-procedure-right-lateral-transaxillary-access
[5] https://www.ctsnet.org/articles/Asen%20Petrov
[6] https://www.ctsnet.org/society/ctsnet