Introduced a new method to analyze and interpret quasar microlensing light curves. In the process it gave a good description of the physical picture. (A)

Used microlensing to learn about the granularity of the mass distribution in galaxies and therefore infer an absolute measurement of the dark matter and stellar content. This is a beautiful example of single-epoch microlensing applications. (A)

A recent review specialized in microlensing as a tool to study planets. (A)

The fascinating discovery of an Earth-like planet using gravitational microlensing. (A)

The foundational paper of galactic microlensing. The basic features of galactic microlensing and its potential as a probe of massive compact objects as dark matter are discussed. This influential paper spurred a number of gravitational lensing experiments. (A)

A comprehensive review of microlensing, covering the history of the field, its theoretical foundations, a critical review of observational results at the time of its writing and a discussion of future prospects. (A)

This adaptive mesh ray-tracing code was written to allow exploration of lensing effects near critical points in the source plane, where very high magnifications can be achieved. (A)

LensTool has been used extensively throughout the literature; this paper provides a good introduction and an overview of its more recently added capabilities. (A)

The lens and source models are similar to GravLens, but exploration of the parameter space proceeds differently, to cope with the more complex cluster systems. The options are manual iteration (for which a graphical interface is provided), and Markov Chain Monte Carlo sampling. Weak lensing data can also be included in a joint fit. (A)

This code finds the best-fitting simple-lens model, while reconstructing an extended source on a pixelated grid, given image data. (A)

While not the first attempt at reconstructing extended lensed sources, this paper provides a good introduction to the topic: much of the galaxy-scale lens modeling work of the last decade builds on this paper. (A)

This code provides an extensive range of simplyparameterized mass models, and a high-resolution lens-equation solver for precise pointlike image position, flux, and time-delay prediction. Likelihood maximization can be performed. (A)

In recent years, the citizen scientists of Galaxy Zoo have been carrying out their own search, rediscovering known lenses and finding interesting new candidates in the SDSS and HST image archives. They can be followed (and joined!) at the Galaxy Zoo forum. (E, I)

Gravitational lensing on the cluster scale is readily observed in almost all of the most massive systems, provided the image resolution and depth are high enough. "Blind" imaging surveys have also been carried out, most notably using SDSS data. Describes the candidate selection and confirmation of 16 new cluster-scale lenses. (A)

The SQLS project was similar to the CLASS survey in that a combination of spectra and imaging was used to make a statistical lens sample, but the data was all taken in the optical and near infrared. (A)

The most prolific lens search to date, the SLACS project involved high-resolution confirmation imaging of a very pure sample of lens candidates, selected for their anomalous SDSS double-galaxy spectra. (A)

The CLASS survey involved a hierarchical tree of ever-higher resolution radio imaging of flat spectrum radio sources with unusual morphologies. By focusing on the sources, not the lenses, the team was able to select the first well-defined, statistically complete sample of lensed objects. (A)

At the time of writing, this is the most accurate measurement of Hubble's constant using a gravitational lens. This rather dense paper explores the most serious sources of systematic error, and includes their mitigation in the final uncertainty estimate. (A)

This classic paper opened up the use of time delays for cosmography. (A)

This is a review of the expansion of the universe, with emphasis on gravitational lensing based measurements. (A)