We request but do not require that use of this software be cited in publications as

* Untergasser A, Cutcutache I, Koressaar T, Ye J, Faircloth BC, Remm M and Rozen SG.
Primer3--new capabilities and interfaces.
Nucleic Acids Res. 2012 Aug 1;40(15):e115.
The paper is available at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3424584/

and

* Koressaar T and Remm M.
Enhancements and modifications of primer design program Primer3.
Bioinformatics 2007;23(10):1289-1291.
The paper is available at https://www.ncbi.nlm.nih.gov/pubmed/17379693

If you use masker function, please cite:
* Koressaar T, Lepamets M, Kaplinski L, Raime K, Andreson R and Remm M.
Primer3_masker: integrating masking of template sequence with primer design software.
Bioinformatics 2018;34(11):1937-1938.
The paper is available at https://www.ncbi.nlm.nih.gov/pubmed/29360956

Source code available at https://github.com/primer3-org/primer3.