Orthogonal polynomial

https://www.encyclopediaofmath.org/index.php/Classical_orthogonal_polynomials  

https://www.encyclopediaofmath.org/index.php/Orthogonal_polynomials  

https://en.wikipedia.org/wiki/Orthogonal_polynomials

https://arxiv.org/pdf/1712.03155.pdf

http://fdslive.oup.com/www.oup.com/academic/pdf/13/9780198506720.pdf

http://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=BA513EAFA987B3C7F36B658EBE3907E4?doi=10.1.1.760.2995&rep=rep1&type=pdf

http://www.math.miami.edu/~morsej/Articles/flj.pdf

http://galton.uchicago.edu/~lalley/Courses/386/OrthogonalPolynomials.pdf

http://arxiv-export-lb.library.cornell.edu/abs/1701.02709  

http://arxiv-export-lb.library.cornell.edu/abs/1801.09099  

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.237.7629&rep=rep1&type=pdf 

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.757.619&rep=rep1&type=pdf