1 INTRODUCTION
2 THEORY AND METHODS
2.1 Background
2.2 Partial sky coverage and quadratic estimators
2.3 Likelihood analysis and band-powers
2.4 Galaxy surveys, shot noise and systematics
2.5 Illustration: recovering the power spectrum of the CMASS sample
3 APPLICATION TO SDSS PHOTOMETRIC QUASARS
3.1 Data and subsamples
3.2 Theory predictions
3.3 Redshift distributions estimates
3.4 Masks and systematics
3.5 Power spectrum results
4 DISCUSSION