ディリクレ固有値
↑ S. Bedo; W. Luthy; H. P. Weber (1993). “The effective absorption coefficient in double-clad fibers”. Optics Communications 99 (5-6): 331–335. Bibcode: 1993OptCo..99..331B. doi:10.1016/0030-4018(93)90338-6. http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TVF-46JGTGD-M5&_user=10&_coverDate=06%2F15%2F1993&_alid=550903253&_rdoc=1&_fmt=summary&_orig=search&_cdi=5533&_sort=d&_docanchor=&view=c&_ct=1&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=c8a4c3ecc3d9a4e9ecb84f96cfef0333.
↑ Leproux, P.; S.