Brihat Parashara Hora Shastra
षष्ठाष्टमव्ययाधीशा अपि कोणेशसंयुता । तेषां दशाऽपि शुभदा कथिता कालकोविदैः ॥ १४॥
The Dasha of Ari‟s, Randhr‟s, or Vyaya‟s Lord also becomes favourable, if they get associated with the Lord of a Trikon.
english translation
SaSThASTamavyayAdhIzA api koNezasaMyutA । teSAM dazA'pi zubhadA kathitA kAlakovidaiH ॥ 14॥
hk transliteration by Sanscript