@article{Morgenthaler:1963:ZFD,
author = {Morgenthaler, George W. and Reismann, Herbert},
title = {Zeros of first derivatives of {B}essel functions of the first
kind, {$J\sb{n}'\,(x)$}, {$21\leq n\leq 51$}, {$0\leq x\leq
100$}},
journal = {J. Res. Nat. Bur. Standards Sect. B},
fjournal = {Journal of Research of the National Bureau of Standards},
volume = {67B},
year = {1963},
number = {3},
pages = {181–183},
issn = {0160-1741},
mrclass = {33.25},
mrnumber = {MR0155021 (27 \#4963)},
zblno = {0118.12803}}