@article{10_4153_CJM_2009_044_1,
     author = {Howard, Benjamin},
     title = {Twisted {Gross{\textendash}Zagier} {Theorems}},
     journal = {Canadian journal of mathematics},
     pages = {828--887},
     year = {2009},
     volume = {61},
     number = {4},
     doi = {10.4153/CJM-2009-044-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2009-044-1/}
}