Solitary waves in the Madelung's fluid: Connection between the nonlinear Schrödinger equation and the Korteweg-de Vries equationR. Fedele and H. SchamelEur. Phys. J. B, 27 3 (2002) 313-320DOI: https://doi.org/10.1140/epjb/e2002-00160-7