TY - JOUR AU - Douglas Franzen AU - M. Young AU - A. Cherin AU - E. Head AU - M. Hackert AU - K. Raine AU - J. Baines C2 - Journal of Lightwave Technology DA - 1989-06-01 00:06:00 LA - en M1 - LT-7 PB - Journal of Lightwave Technology PY - 1989 TI - Numerical Aperture of Multimode Fibers by Several Methods: Resolving Differences ER -