Brihat Parashara Hora Shastra
राज्यं करोति मित्रांशं गजवाजिसमन्वितम् । दशदौ राजयोगश्च दशामध्ये महद्भयम् ॥ ७५॥
At the commencement of the Ketu Dasha there will be Raj Yog.
english translation
rAjyaM karoti mitrAMzaM gajavAjisamanvitam । dazadau rAjayogazca dazAmadhye mahadbhayam ॥ 75॥
hk transliteration by Sanscript