Agniveshyagrihyasutra 3.12.1.v-9

3.12.1.v-9

kṛcchrātikṛcchraṃ ṣaṇmāse tripakṣe taptameva ca \

[He should perform] a kṛcchrātikṛcchra penance for a six-month [śrāddha], and a taptakṛcchra for a three-fortnight [śrāddha];