@article{articlec4fcae1d,
title   = {Measurement of acoustical second-order Doppler effect as an introductory experiment to special relativity},
author = {Schiel, Dietrich and Slaets, Jan Frans Willem and Mascarenhas, Sérgio},
year = {1978},
doi = {10.1119/1.11136},
journal   = {American Journal of Physics}
}