Borrell, Josefa Gardeñas, and Isília Aparecida Silva. 2000. “Gastric Probe Used in Pré-Term Newborn: Study of the Alteration in Flexibility of Constituent Polymer”. Revista Da Escola De Enfermagem Da USP 34 (3): 302-8. https://doi.org/10.1590/S0080-62342000000300012.