Warttig SL, Forshaw MJ, South J, White AK. New, normative, English-sample data for the Short Form Perceived Stress Scale (PSS-4). J Health Psychol. 2013 Dec;18(12):1617-28. doi: 10.1177/1359105313508346
Williams AG, Dhamrait SS, Wootton PT, Day SH, Hawe E, Payne JR, Myerson SG, World M, Budgett R, Humphries SE, Montgomery HE. Bradykinin receptor gene variant and human physical performance. J Appl Physiol. 2004;96(3):938-42.
Arana JI, Jarén C, Arana A, Arazuri S. Pruebas diagnósticas en la clasificación de productos agrícolas. Horticultura. 2001;19:20-6.