The value of the valsalva test in assessing changes in the end part of the ventricular complex of the ecg during physical overstrain - PDF (Russian)
© 1972 levina L.I., Surov E.N.
![Creative Commons License](https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png)
This work is licensed
under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.