Internasional doi.org (Global: 2nd place ; Indonesian: 2nd place ) Lang, S. B. (1999). "The history of pyroelectricity: From ancient Greece to space missions". Ferroelectrics . 230 (1): 99– 108. doi :10.1080/00150199908214903 . Hankel, W. G. (1858). "XI. On the development of electricity between metals and heated salts" . The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science (dalam bahasa Inggris). 16 (105): 101– 103. doi :10.1080/14786445808642540 . ISSN 1941-5982 . Hankel, W. G. (1860). "II. On the electric deportment of the flame of alcohol" . The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science (dalam bahasa Inggris). 19 (124): 9– 13. doi :10.1080/14786446008642815 . ISSN 1941-5982 . Hankel, W. G. (1889). "Das electrodynamische Gesetz ein Punktgesetz" . Annalen der Physik (dalam bahasa Jerman). 272 (1): 73– 93. doi :10.1002/andp.18882720104 . Hankel, W. G. (1859). "Ueber das Verhalten der Weingeistflamme in elektrischer Beziehung" . Annalen der Physik und Chemie (dalam bahasa Jerman). 184 (9): 146– 153. doi :10.1002/andp.18591840909 . Hankel, W. G. (1858). "Ueber Elektricitätserregung zwischen Metallen und erhitzten Salzen" . Annalen der Physik und Chemie (dalam bahasa Jerman). 179 (4): 612– 616. doi :10.1002/andp.18581790405 . isni.org (Global: low place ; Indonesian: low place )