[4] Gruber J, Heitz J, Strasser H, et al. Spectrochimica Acta Part B, 2001, 56(6): 685.
[5] Lithgow G A, Robinson A L, Buckley S G. Atmospheric Environment, 2004, 38(20): 3319.
[6] Colao F, Fantoni R, Lazic V, et al. Planetary and Space Science, 2004, 52(1-3): 117.
[7] Koch S, Court R, Garen W, et al. Spectrochimica Acta Part B, 2005, 60(7-8): 1230.
[8] Alamelu D, Sarkar A, Aggarwal S K. Talanta, 2008, 77(1): 256.
[9] Rai N K, Rai A K. Journal of Hazardous Materials, 2008, 150(3): 835.
[15] NIST electronic database, at http://physics.nist.gov/PhysRefData.