Heat conduction dynamics are described by partial differential equations. Their approximations with a set of finite number of ordinary differential equations are often required for simpler computations and analyses. Rational approximations of the Laplace solutions such as the Pade approximation can be used for this purpose. For some heat conduction problems appearing in a semi-infinite slab, however, such rational approximations are not easy to obtain because the Laplace solutions are not analytic at the origin. In this article, a continued fraction method has been proposed to obtain rational approximations of such heat conduction dynamics in a semi-infinite slab.
 Lee, J. and Kim, D.H. (1998) High-Order Approximations for Noncyclic and Cyclic Adsorption in a Particle. Chemical Engineering Science, 53, 1209-1221.
 Kim, D.H. and Lee, J. (1999) High-Order Approximations for Noncyclic and Cyclic Adsorption in a Biporous Adsorbent. Korean Journal of Chemical Engineering, 16, 69-74.
 Lee, J. and Kim, D.H. (2011) Simple High-Order Approximations for Unsteady-state Diffusion, Adsorption and Reaction in a Catalyst: A Unified Method by a Continued Fraction for Slab, Cylinder and Sphere Geometries. Chemical Engineering Journal, 173, 644-650.
 Chen, C.F. and Shieh, L.S. (1969) Continued Fraction Inversion by Routh’s Algorithm. IEEE Transactions on Circuit Theory, 16, 197-202.
 (2012) Maple, Waterloo Maple Software Inc. www.maplesoft.com