Brihat Parashara Hora Shastra
जन्मलग्नत्रिकोणेषु यो राशिर्बलवान् भवेत् । तमार्भ्य नयेद् धीमान् चरिपर्यायवद् दशाम् ॥ १८३॥
In this system the first Dasha commences from the strongest amongst the Rāśis in Kon (Trikon) to Lagn (Tanu, Putr and Dharm). This system is similar to the Char Dasha.
english translation
janmalagnatrikoNeSu yo rAzirbalavAn bhavet । tamArbhya nayed dhImAn cariparyAyavad dazAm ॥ 183॥
hk transliteration by Sanscript