Devibhagavatapurana 8.16.36

Devībhāgavatapurāṇa 8.16.36

tata uttarataḥ proktamekādaśasulakṣakaiḥ |
yojanaiḥ parisaṅkhyātaṃ saptarṣīṇāṃ ca maṇḍalam ||