What mantras help mitigate Pitra Dosh?

Mantras like the Pitra Gayatri Mantra (“Om Pitra Ganaya Vidmahe, Jagat Dharine Dheemahi, Tanno Pitro Prachodayat”), Maha Mrityunjaya Mantra, Vishnu Mantras (like “Om Namo Bhagavate Vasudevaya”), or specific Pitra Dosh Nivaran Mantras (“Om Shreem Sarva Pitra Dosha Nivaranay klesham Han Han Sukh Shantim Dehi Phat Swaha”) are recommended.