Examples: <ex>

[1]	D. Naujoks et. al. J. Nucl. Mat. 266-269 (1999) p360 - 364, <ex> = 1.45e-14 * exp(-3.19/Te) / Te**0.28 * 1.e6
[2]	U. Fantz J. Nucl. Mat. 337-339 (2005) p1087 - 1091, and: U. Fantz priv. comm. 2005
[3]	U. Fantz, D. Wuenderlich, Atomic and Plasma-Material Interaction Data for Fusion, Vol 16 (2011), p 75, IAEA, Vienna, and: D. Wuenderlich priv. comm. 2011