Analysis of the reliability of ultrasonic estimates of the posturination+ residue

1. Luján Galán, M.
2. Paez Borda, A.
3. Martín Oses, E.
4. Ruiz i Fernández, J.L.
5. Gómez Trimiño, M.
6. Llorente Abarca, C.
7. Berenguer Sánchez, A.