@article{10_4064_aa124_3_4,
     author = {Antonia W. Bluher and Alain Lasjaunias},
     title = {Hyperquadratic power series of degree four},
     journal = {Acta Arithmetica},
     pages = {257--268},
     publisher = {mathdoc},
     volume = {124},
     number = {3},
     year = {2006},
     doi = {10.4064/aa124-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa124-3-4/}
}