Pattern formation in bubbles emerging periodically from a liquid free surface H. N. Yoshikawa, C. Mathis, P. Maıssa, G. Rousseaux and S. Douady Eur. Phys. J. E, 33 1 (2010) 11-18 Published online: 17 September 2010 DOI: 10.1140/epje/i2010-10645-8