According to the preface, which two major biographical works are considered suitable for Parayan in Maharashtra, and who authored them?

The preface identifies two primary, detailed poetic biographies suitable for Parayan and Saptah. The first is the ancient and revered Guru Charitra, a sweet and graceful work written by Shri Saraswati Gangadhar about Shri Samarth Sadguru Narsimha Saraswati Maharaj. As mentioned in Chapter 0, the second is the more recent Shri Sai Satcharita, an inspirational and grace-filled biography of Shri Sai Baba Maharaj. This work was authored by the late devotee Shri Govind Raghunath, also known as Annasaheb Dabholkar, and was notably published chapter by chapter in the Shri Sai Leela magazine over six years.