Arthashastra
बहुषु प्रत्यासन्नं धार्मिकं भर्म समर्थं कनिष्ठम् अभार्यं वा ॥
If there are a number of brothers to her lost husband, she shall marry such a one of them as is next in age to her former husband, or as is virtuous and is capable of protecting her, or one who is the youngest and unmarried.
english translation
bahuSu pratyAsannaM dhArmikaM bharma samarthaM kaniSTham abhAryaM vA ॥
hk transliteration by Sanscript