Description  Claims  Cited references 

WO2008026768A   [0004] 
EP2062887A   [0004] 
WO2009104802A   [0004] 
WO2013129443A   [0004] 

HANDBOOK OF PHARMACEUTICAL SALTS: PROPERTIES, SELECTION AND USE   [0018] 
Pharmaceutical Salts   [0018] 
Remington: The Science and Practice of Pharmacy   [0019] 
Enantiomers, Racemates, and Resolutions   [0023] 
The United States Pharmacopeia #23   [0054]