User talk:49.206.117.87

Please do not add or change content without citing a reliable source using an inline citation that clearly supports the material. The burden is on the person wishing to keep in the material to meet these requirements, as a necessary (but not always sufficient) condition. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. Materialscientist (talk) 08:34, 25 February 2017 (UTC)