LRotationf function details

Hi, can anyone point me as to where the LRotationf function resides?
i want to copy it and apply to WEBGL code. thanks!

In the source code, panda/src/linmath there are files lrotation_src.h, lrotation_src.cxx and lrotation_src.I. It inherits from LQuaternion, which is defined in lquaternion_src.h, etc.