1. Thermal sensors based on the seebeck effect
2. A. Lerm, A. Wiegand and M. Köhler, GDR patent applications WP C23F/255358-8 and C23F/255359-6 (1983).
3. T. Elbel, J. Müller and F. Völklein, U.S. patent 4,665,276 (1984).
4. Multijunction thin-film radiation thermopile sensors