TY - GEN AU - Meissner,M D AU - Hakki,A H AU - Iskandrian,A S TI - Rapid method to determine the electrocardiographic frontal plane axis SN - 0002-9149 PY - 1990///0504 KW - Electrocardiography KW - methods KW - Humans KW - Mathematics N1 - Publication Type: Journal Article UR - https://doi.org/10.1016/0002-9149(90)91451-b ER -