TY - RPRT TI - A simple method to determine the electrocardiographic frontal plane axis. AU - A H Hakki AU - G J Anderson AU - A S Iskandrian AU - B L Segal PY - 1982 DO - 10.1016/s0022-0736(82)80031-9 UR - https://pubmed.ncbi.nlm.nih.gov/7119639/ ID - 7119639 ER -