Neeldhara Misra Hannes Moser Venkatesh Raman 0001 Saket Saurabh 0001 Somnath Sikdar The Parameterized Complexity of Unique Coverage and Its Variants. 517-544 2013 65 Algorithmica 3 https://doi.org/10.1007/s00453-011-9608-0 db/journals/algorithmica/algorithmica65.html#MisraMRSS13