@article{article627d7329,
title   = {Frequency variation of mechanical waves of the impulse tomograph based on geographic north},
author = {Mendes, Flavio Henrique and Silva Filho, Demóstenes Ferreira da},
year = {2019},
doi = {10.18671/scifor.v47n122.18},
journal   = {Scientia Forestalis}
}