Phaladeepika
तद्वाक्यवर्णक्रमशोपहार- वर्षाहते तत्परमायुराप्ते । तदा दशायामपहारवर्ष- संख्याश्च मासान्दिवसान्वदेयुः ॥ १३॥
The Apahara or Bhukti of any of the planet constituting a Mahadasa is thus obtained. Find out the particular mnemonical syllable (out of the nine syllables) composing a formula whose Bhukti is wanted and find out the owner of the Rasi signified by that syllable. Multiply the number of years assigned to this planet by the number of years fixed for the planet whose Mahadasa is under consideration and devide the product by the total number of years constituting the entire Ayus of the formula or Chakra. The quotient in years, etc, will represent the sub period required.
english translation
tadvAkyavarNakramazopahAra- varSAhate tatparamAyurApte । tadA dazAyAmapahAravarSa- saMkhyAzca mAsAndivasAnvadeyuH ॥ 13॥
hk transliteration by Sanscript