Bartoshevich, "A heat-conduction
problem," Journal of Engineering Physics, vol.
problems with melting or freezing, Journal of Heat Transfer 91(3): 421-426.
Nicolson, "A practical method for numerical evaluation of solutions of partial differential equations of the heat-conduction
type," Mathematical Proceedings of the Cambridge Philosophical Society, vol.
coefficient is non-zero only in the direction normal to the contact plane.
Since 1906, Pirani gauges based on the principle of heat-conduction
have been used to measure absolute pressure in the fine vacuum range.