@article{Guzik:2006,
author = "P. Guzik and J. Piskorski and T. Krauze and A. Wykrętowicz and H. Wysocki",
title = "Heart rate asymmetry by Poincare plots of RR intervals",
journal = "Biomedizinische Technik",
volume = "Vol. 51",
number = "4",
pages = "272--275",
year = "2006",
}