Patterns of spatial and temporal cranial muscle development in the African clawed frog, Xenopus laevis (Anura: Pipidae).
Ziermann JM, Olsson L. Patterns of spatial and temporal cranial muscle development in the African clawed frog, Xenopus laevis (Anura: Pipidae). J Morphol. 2007 Sep; 268(9):791-804.