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(C 3 N 6 H 7 )BF 4 ·H 2 O and (C 3 N 6 H 7 )SO 3 CH 3 ·H 2 O with large birefringence.
Patrick W. FowlerErich Steiner
A. SattlerStefanie SchönbergerWolfgang Schnick
J. NoltePeter NeubauerHartmut VogtM. Meisel
Yaoguo ShenBo ChenHao ChenJunhua Luo
S. PrakashS. NaveenN.K. LokanathP.A. SuchetanIsmail Warad