BESSELI, BESSELJ, BESSELK, and BESSELY do have no example at all. Moreover I do not understand the difference as reader between these 4 functions (actually all have the same explanation) See also Apple's help and examples on https://help.apple.com/functions/mac/7.0/?lang=en#/ffa566c376 BESSELJ and https://help.apple.com/functions/mac/7.0/?lang=en#/ffa56b4a02 BESSELY (the other two functions are not implemented by Apple) A general idea: should we add Wikipedia links to Bessel?
NEW.
Olivier Hallot committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/help/commit/?id=fb9858706e57e5e000326ccaabda5e7578bf33be tdf#103431 HELP Bessel functions need examples