@article{10_4064_aa122_1_8,
     author = {Fernando Chamizo and Adri\'an Ubis},
     title = {An average formula for the class number},
     journal = {Acta Arithmetica},
     pages = {75--90},
     publisher = {mathdoc},
     volume = {122},
     number = {1},
     year = {2006},
     doi = {10.4064/aa122-1-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa122-1-8/}
}