Petrila, Titus. “CVBEM for the Fluid Flow Determined by the Motion of a Dirigible Balloon in a Wind Stream”. Rev. Anal. Numér. Théor. Approx. 27, no. 1 (February 1, 1998): 155–165. Accessed May 24, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1998-vol27-no1-art16.