@article{10_1017_S0017089500007783,
     author = {Heineken, Hermann},
     title = {On {E-groups} in the sense of {Peng}},
     journal = {Glasgow mathematical journal},
     pages = {231--242},
     year = {1989},
     volume = {31},
     number = {2},
     doi = {10.1017/S0017089500007783},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007783/}
}