Matarazzo, G. “Asymptotic Solutions of the Dirichlet Problem for the Heat Equation With Impulses”.
Ukrains’kyi Matematychnyi Zhurnal
, vol. 58, no. 3, Mar. 2006, pp. 427–430,
https://umj.imath.kiev.ua/index.php/umj/article/view/3465
.