Brihat Parashara Hora Shastra
आसन्नकेन्द्रद्वयगैः सर्वैर्योगो गदाह्वयः । शकटं लग्नजायास्थैः खाम्बुगैर्विहगः स्मृतः ॥ ९॥
Gada, Sakat, Vihag, Shringatak, Hal, Vajr and Yav Yogas. If all the Grahas occupy two successive Kendras, Gada Yog is formed. Sakat Yog occurs, when all the Grahas are disposed in Lagn and Yuvati Bhava. If all confine to Bandhu and Karm Bhava, then Vihag Yog occurs.
english translation
AsannakendradvayagaiH sarvairyogo gadAhvayaH । zakaTaM lagnajAyAsthaiH khAmbugairvihagaH smRtaH ॥ 9॥
hk transliteration by Sanscript