@article{CRMATH_2006__342_10_741_0,
     author = {Gentili, Graziano and Struppa, Daniele C.},
     title = {A new approach to {Cullen-regular} functions of a quaternionic variable},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {741--744},
     publisher = {Elsevier},
     volume = {342},
     number = {10},
     year = {2006},
     doi = {10.1016/j.crma.2006.03.015},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2006.03.015/}
}