Antonelli, M., Cirigliano, V., Isidori, G., Mescia, F., Moulson, M., Neufeld, H., et al. (2010). An evaluation of |Vus| and precise tests of the Standard Model from world data on leptonic and semileptonic kaon decays. Eur. Phys. J. C, 69(3-4), 399–424.