@article{10_4064_aa_53_4_403_420,
     author = {K. Ramanathan},
     title = {Ramanujan's modular equations},
     journal = {Acta Arithmetica},
     pages = {403--420},
     publisher = {mathdoc},
     volume = {53},
     number = {4},
     year = {1989},
     doi = {10.4064/aa-53-4-403-420},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-53-4-403-420/}
}