Petříček, V.; Van Der Lee, A.; Evain, M. (1995). "On the use of crenel functions for occupationally modulated structures". Acta Crystallographica Section A. 51 (4): 529. Bibcode:1995AcCrA..51..529P. doi:10.1107/S0108767395000365.
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Petříček, V.; Van Der Lee, A.; Evain, M. (1995). "On the use of crenel functions for occupationally modulated structures". Acta Crystallographica Section A. 51 (4): 529. Bibcode:1995AcCrA..51..529P. doi:10.1107/S0108767395000365.