The text mentions several Guru biographies. Which ones are described as being particularly short or not widely published, and what details are given?

According to Chapter 0, several biographies are noted for their limited scope or availability. The two biographies of Sai Baba written by Shri Dasganu Maharaj, found in Bhaktalilamrut and Bhaktisaramrut, are described as "excellent, heart-touching, and graceful," but also explicitly "very short." Another work, the Guru biography by Shri Samarth Sadguru Dattatreya Maharaj of Balekundri, is mentioned in Chapter 0, but the text states it "does not yet seem to have been printed or published." This distinguishes them from the more detailed and famous works that form the main subject of the Satcharita.