Quang, Dinh, Lam, Tran, AND Tien, Nguyen. " The Relative Gut Length and Gastro-Somatic Indices of the Mudskipper Periophthalmodon septemradiatus (Hamilton, 1822) from the Hau River" VNU Journal of Science: Natural Sciences and Technology [Online], Volume 34 Number 3 (24 September 2018)