Compounds with the MnP and NiAs type structures

Reference: https://books.google.dz/books?id=xzUXBQAAQBAJ&pg=PA121&lpg=PA121&dq=equivalence+between+NiAs+and+MnP+structures&source=bl&ots=U2LGSau_nC&sig=W87ZpeKdcMpTgEMtYM64hrgCY9M&hl=fr&sa=X&redir_esc=y#v=onepage&q=equivalence%20between%20NiAs%20and%20MnP%20structures&f=false