字母频率 (Chinese Wikipedia)
Analysis of information sources in references of the Wikipedia article "字母频率" in Chinese language version.
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algoritmy.net
en.algoritmy.net
- Mička, Pavel. Letter frequency (English). Algoritmy.net. [2013-06-05]. （原始内容存档于2021-03-04）.
archive.org
- Pratt, Fletcher. Secret and Urgent: the Story of Codes and Ciphers. Garden City, N.Y.: Blue Ribbon Books. 1942: 254–5. OCLC 795065.
bellsouthpwp.net
- lipu pi jan Jakopo pi toki pona. [2007-09-14]. （原始内容存档于2007-11-14）.
books.google.com
- Beker, Henry; Piper, Fred. Cipher Systems: The Protection of Communications. Wiley-Interscience. 1982: 397. Table also available from Lewand, Robert. Cryptological Mathematics. The Mathematical Association of America. 2000: 36 [2013-06-05]. ISBN 978-0-88385-719-9. （原始内容存档于2020-08-01）. and 存档副本. [2008-06-25]. （原始内容存档于2008-07-08）.
cam.ac.uk
cl.cam.ac.uk
- Lee, E. Stewart. Essays about Computer Security (PDF). University of Cambridge Computer Laboratory: 181. [2010-02-13]. （原始内容存档 (PDF)于2011-06-04）.
central.edu
pages.central.edu
- Beker, Henry; Piper, Fred. Cipher Systems: The Protection of Communications. Wiley-Interscience. 1982: 397. Table also available from Lewand, Robert. Cryptological Mathematics. The Mathematical Association of America. 2000: 36 [2013-06-05]. ISBN 978-0-88385-719-9. （原始内容存档于2020-08-01）. and 存档副本. [2008-06-25]. （原始内容存档于2008-07-08）.
data-compression.com
- Statistical Distributions of English Text. [2013-06-05]. （原始内容存档于2004-06-03）.
doi.org
- Li, Wentian; Miramontes, Pedro. Fitting ranked English and Spanish letter frequency distribution in US and Mexican presidential speeches. Journal of Quantitative Linguistics. 2011, 18 (4): 359. doi:10.1080/09296174.2011.608606.
- Gamow, George; Ycas, Martynas. Statistical correlation of protein and ribonucleic acid composition (PDF). Proc. Natl. Acad. Sci. 1955, 41 (12): 1011–19 [2013-06-05]. PMC 528190
. doi:10.1073/pnas.41.12.1011. （原始内容存档 (PDF)于2015-09-24）.
gutenberg.org
- Poe, Edgar Allan. The works of Edgar Allan Poe in five volumes. Project Gutenberg. [2013-06-05]. （原始内容存档于2015-09-24）.
korzen.org
- Wstęp do kryptologii （页面存档备份，存于互联网档案馆）, counting [space] 17.2%, [dot point] 0.9%, [comma] 0.9% and [semicolon] 0.5%
lingvakritiko.com
- La Oftecoj de la Esperantaj Literoj. [2007-09-14]. （原始内容存档于2021-01-17）.
nih.gov
ncbi.nlm.nih.gov
- Gamow, George; Ycas, Martynas. Statistical correlation of protein and ribonucleic acid composition (PDF). Proc. Natl. Acad. Sci. 1955, 41 (12): 1011–19 [2013-06-05]. PMC 528190 . doi:10.1073/pnas.41.12.1011. （原始内容存档 (PDF)于2015-09-24）.
nltk.googlecode.com
- Calculated from "Project Gutenberg Selections" available from the NLTK Corpora （页面存档备份，存于互联网档案馆）
numaboa.com
- Frequência da ocorrência de letras no Português. [2009-06-16]. （原始内容存档于2009-08-03）.
onzetaal.nl
- Letterfrequenties. Genootschap OnzeTaal. [2009-05-17]. （原始内容存档于2011-07-24）.
oxforddictionaries.com
- What is the frequency of the letters of the alphabet in English?. Oxford Dictionary. Oxford University Press. [29 December 2012]. （原始内容存档于2015-04-22）.
pnas.org
- Gamow, George; Ycas, Martynas. Statistical correlation of protein and ribonucleic acid composition (PDF). Proc. Natl. Acad. Sci. 1955, 41 (12): 1011–19 [2013-06-05]. PMC 528190 . doi:10.1073/pnas.41.12.1011. （原始内容存档 (PDF)于2015-09-24）.
web.archive.org
- Gamow, George; Ycas, Martynas. Statistical correlation of protein and ribonucleic acid composition (PDF). Proc. Natl. Acad. Sci. 1955, 41 (12): 1011–19 [2013-06-05]. PMC 528190 . doi:10.1073/pnas.41.12.1011. （原始内容存档 (PDF)于2015-09-24）.
- Poe, Edgar Allan. The works of Edgar Allan Poe in five volumes. Project Gutenberg. [2013-06-05]. （原始内容存档于2015-09-24）.
- Beker, Henry; Piper, Fred. Cipher Systems: The Protection of Communications. Wiley-Interscience. 1982: 397. Table also available from Lewand, Robert. Cryptological Mathematics. The Mathematical Association of America. 2000: 36 [2013-06-05]. ISBN 978-0-88385-719-9. （原始内容存档于2020-08-01）. and 存档副本. [2008-06-25]. （原始内容存档于2008-07-08）.
- Mička, Pavel. Letter frequency (English). Algoritmy.net. [2013-06-05]. （原始内容存档于2021-03-04）.
- What is the frequency of the letters of the alphabet in English?. Oxford Dictionary. Oxford University Press. [29 December 2012]. （原始内容存档于2015-04-22）.
- Statistical Distributions of English Text. [2013-06-05]. （原始内容存档于2004-06-03）.
- Lee, E. Stewart. Essays about Computer Security (PDF). University of Cambridge Computer Laboratory: 181. [2010-02-13]. （原始内容存档 (PDF)于2011-06-04）.
- Calculated from "Project Gutenberg Selections" available from the NLTK Corpora （页面存档备份，存于互联网档案馆）
- CorpusDeThomasTempé. [2007-06-15]. （原始内容存档于2007-09-30）.
- Frequência da ocorrência de letras no Português. [2009-06-16]. （原始内容存档于2009-08-03）.
- La Oftecoj de la Esperantaj Literoj. [2007-09-14]. （原始内容存档于2021-01-17）.
- Wstęp do kryptologii （页面存档备份，存于互联网档案馆）, counting [space] 17.2%, [dot point] 0.9%, [comma] 0.9% and [semicolon] 0.5%
- Letterfrequenties. Genootschap OnzeTaal. [2009-05-17]. （原始内容存档于2011-07-24）.
- lipu pi jan Jakopo pi toki pona. [2007-09-14]. （原始内容存档于2007-11-14）.
worldcat.org
- Zim, Herbert Spencer. Codes & Secret Writing: Authorized Abridgement. Scholastic Book Services. 1961. OCLC 317853773.
- Pratt, Fletcher. Secret and Urgent: the Story of Codes and Ciphers. Garden City, N.Y.: Blue Ribbon Books. 1942: 254–5. OCLC 795065.
- Singh, Simon; Galli, Stefano. Codici e Segreti. Milano: Rizzoli. 1999. ISBN 978-8-817-86213-4. OCLC 535461359 （意大利语）.
- Singh, Simon; Brogren, Margareta. Kodboken : konsten att skapa sekretess - från det gamla Egypten till kvantkryptering. Stockholm: Norstedts. 1999. ISBN 978-9-113-00708-3. OCLC 186495779 （瑞典语）.