@article{10_4064_aa8556_2_2017,
     author = {SoYoung Choi and Chang Heon Kim},
     title = {Rational period functions and indefinite binary quadratic forms in higher level cases},
     journal = {Acta Arithmetica},
     pages = {319--334},
     publisher = {mathdoc},
     volume = {179},
     number = {4},
     year = {2017},
     doi = {10.4064/aa8556-2-2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa8556-2-2017/}
}