The HARPS search for southern extra-solar planets: XLIII. A compact system of four super-Earth planets orbiting HD 215152

por Delisle, J.-B., Ségransan, D., Dumusque, X., Diaz, R.F., Bouchy, F., Lovis, C., Pepe, F., Udry, S., Alonso, R., Benz, W., Coffinet, A., Collier Cameron, A., Deleuil, M., Figueira, P., Gillon, M., Lo Curto, G., Mayor, M., Mordasini, C., Motalebi, F., Moutou, C., Pollacco, D., Pompei, E., Queloz, D., Santos, N.C., Wyttenbach, A.