Butler, J.P. and A. Tsuda. Effect of convective stretching and folding on aerosol mixing deep in the lung, assessed by approximate entropy. J. Appl. Physiol. 83: 800-809, 1997.

Butler, J.P. Hopping hoops dont hop. Amer. Math. Monthly, 106(6):565-568, 1999

Butler, J.P., I.M. Tolic-Norrelykke, B. Fabry, and J.J. Fredberg. Traction fields, moments, and strain energy that cells exert on their surroundings. Am. J. Physiol. Cell Physiol. 282: C595-C605, 2002.

Butler, J.P., R.E. Brown, D. Stamenovic, J.P. Morris, and G.P. Topulos. Effect of surface tension on alveolar surface area. J Appl Physiol 93: 1015-1022, 2002.

Tsuda, A., R.A. Rogers, P.E. Hydon, and J.P. Butler. Chaotic mixing deep in the lung. Proc. Natl. Acad. Sciences 99: 10173-10178, 2002.

Gouldstone, A., R.E. Brown, J.P. Butler, and S.H. Loring. Elastohydrodynamic separation of pleural surfaces during breathing. Respir Physiol Neurobiol 137: 97-106, 2003.

Yanai, M., J.P. Butler, T. Suzuki, H. Sasaki, and H. Higuchi. Regional rheological differences in locomoting neutrophils. Am J Physiol Cell Physiol. 287(3): C603-611, 2004.