1. Introduction

2. The OTELO survey data

3. Selection and analysis of emission line sources

4. Emission-line-source detection in OTELO from simulations

5. The case of [O III] ELSs at $\langle\pmb{\mathrm{z}}\rangle{=}\pmb{0.83}$

6. The [O III] luminosity function

7. Discussion

8. Summary