The LBFGS++ library was adapted from the libLBFGS library (https://github.com/chokkan/liblbfgs), written by Naoaki Okazaki <okazaki@c.titech.ac.jp>.
The files
include/LBFGS/LineSearchBracketing.hinclude/LBFGS/LineSearchNocedalWright.h
were contributed by Dirk Toewe <DirkToewe@GoogleMail.com>.
Other part of LBFGS++ was written by Yixuan Qiu <yixuan.qiu@cos.name>.