TY - JOUR AU - G. Natanson BT - Chemical Physics Letters DA - Jan-11-1985 DO - 10.1016/0009-2614(85)87190-6 PY - 1985 SP - 343 EP - 346 T2 - Chemical Physics Letters TI - Analytical formula for direction cosines of the Eckart frame of a planar molecule UR - http://linkinghub.elsevier.com/retrieve/pii/0009261485871906 VL - 121 SN - 00092614 ER -