Theoretical and experimental study of vibration-amplitude liquid densimeter on the basis of a high-quality tubular resonatorT. K. Huseynov, T. T. Gadirova, B. K. Amiraslanov, N. A. Abdulova, A. I. Quliyeva and K. R. HaciyevaE3S Web Conf., 124 (2019) 03004DOI: https://doi.org/10.1051/e3sconf/201912403004