Zhi-Zhong Chen Tao Jiang Guo-Hui Lin Jianjun Wen Dong Xu Ying Xu Improved Approximation Algorithms for NMR Spectral Peak Assignment. 82-96 2002 conf/wabi/2002 WABI http://link.springer.de/link/service/series/0558/bibs/2452/24520082.htm db/conf/wabi/wabi2002.html#ChenJLWXX02