Go on. SPIE 5006 refers to volume 5006 of conference proceedings published by the Society of Photooptical Instrument Engineers (SPIE), whose theme is stereoscopic display and virtual reality system X. Most of the papers in it are about stereoscopic vision and virtual reality.

As for proc. Ieeeint.conf.acoustics speech signal processing, the full name is the proceedings of IEEE International Conference on Acoustic Speech Signal Processing.