The text mentions a scarcity of certain types of spiritual literature in Maharashtra. Which two famous and comprehensive Guru biographies are highlighted as exceptions, and who are their authors?

The preface notes that while many biographies have been written, there are very few ancient, detailed, and poetic works in Maharashtra that are suitable for Parayans and Saptahs. Chapter 0 identifies two primary exceptions to this. The first is the 'Brihat or Thorale Guru Charitra,' a sweet and graceful biography of Shri Samarth Sadguru Narsimha Saraswati Maharaj, which was written by Shri Saraswati Gangadhar. The second significant work mentioned is the 'Shri Sai Satcharita,' a recent, sweet, and inspirational biography of Shri Sai Baba Maharaj, which was authored by the late devotee Shri Govind Raghunath, also known as Annasaheb Dabholkar.