Yohannes, E., Lee, R. W., Valcu, M., & Kempenaers, B. (2012). Feather deuterium as an indicator of age-class in the Pectoral Sandpiper Calidris melanotos. Ibis, 154(4), 868-873. doi:10.1111/j.1474-919X.2012.01245.x.