Infrared and Raman spectra of magnesium ammonium phosphate hexahydrate (struvite) and its isomorphous analogues. V. Spectra of protiated and partially deuterated magnesium ammonium arsenate hexahydrate (arsenstruvite) - V. Stefov, B. Šoptrajanov, M. Najdoski, B. Engelen, H. D. Lutz (My University, 2008)