@article {Ransohoff2013, title = {Ivan {\v S}i{\v s}man and the Ottoman Conquest of Bulgaria (1371{\textendash}1395): A Reconsideration}, journal = {Palaeobulgarica / Старобългаристика}, volume = {37}, year = {2013}, pages = {89{\textendash}100}, author = {Ransohoff, Jake} }