@article{10_4064_aa150_4_3,
     author = {Kejian Xu and Zhaopeng Dai and Zongduo Dai},
     title = {The formulas for the coefficients of the sum and product
 of $p $-adic integers with applications to {Witt} vectors},
     journal = {Acta Arithmetica},
     pages = {361--384},
     publisher = {mathdoc},
     volume = {150},
     number = {4},
     year = {2011},
     doi = {10.4064/aa150-4-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa150-4-3/}
}