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Books about Kaikaus:
Zeisei koso kokka no sebone: Yuganda kaikau, minshu kokka no shitsu o tou (Japanese Edition) by Nagaharu Hayabusa (1989)
Nihon no gyosei kaikaku: Seido kaikau no seiji to gyosei (Japanese Edition) by Kuei-jung Mao (1997)
Kokkai ronso Nihonkoku Kenpo: Seiji kaikau, PKO, kaigai hahei (Japanese Edition) by Mitsuo Higashinaka (1994)
Wiki information Kaikaus:
Rukunuddin Kaikaus was the independent Sultan of Bengal. In 1291 he succeeded his father Nasiruddin Bughra Khan. In several inscriptions and coins he styled himself as Sultan-bin-Sultan and also Sultan-us-Salatin.