What are the two primary examples of detailed Guru biographies suitable for Parayans mentioned in the preface, and who authored them?

Chapter 0 highlights two specific poetic Guru biographies in Maharashtra that are considered comprehensive and famous enough for Parayans and Saptahs. The first is the 'Brihat or Thorale Guru Charitra,' a biography of Shri Samarth Sadguru Narsimha Saraswati Maharaj, which was written by Shri Saraswati Gangadhar. The second, more recent work mentioned is the 'Shri Sai Satcharita.' This inspirational biography of Shri Sachidanand Samarth Sadguru Sai Baba Maharaj was written by the devotee Shri Govind Raghunath, also known as Annasaheb Dabholkar, and was the subject of the preface itself.