In a cristallographic zone it may occur face symbols whose Miller indices, placed in a certain order, form what we know, in Algebra, by the designation of "harmonic series". This work indicates the way such possibility may be researched.
• An. Esc. Super. Agric. Luiz de Queiroz 22 • 1965 • https://doi.org/10.1590/S0071-12761965000100008 copy