Paper  doi  bibtex   

@article{Haegemans1977,
author = {Haegemans, Ann and Piessens, Robert},
title = {Construction of Cubature Formulas of Degree Seven and Nine Symmetric Planar Regions, Using Orthogonal Polynomials},
journal = {SIAM Journal on Numerical Analysis},
volume = {14},
number = {3},
pages = {492-508},
year = {1977},
doi = {10.1137/0714029},

URL = { 
        https://doi.org/10.1137/0714029
    
},
eprint = { 
        https://doi.org/10.1137/0714029
    
}

}