Standard Reference Material (SRM 1990) for Single Crystal Diffractometer Alignment - Wong-Ng, W.; Siegrist, T.; DeTitta, G.T.; Finger, L.W.; Evans Jr., H.; Gabe, E.J.; Enright, G.D.; Armstrong, J.T.; Levenson, M.; Cook, L.P.; Hubbard, C.R. (Journal of Research of the National Institute of Standards and Technology, 2001)