@article{10_1017_S001708950003113X,
     author = {Li, Shi-Jie},
     title = {Null 2-type {Chen} surfaces},
     journal = {Glasgow mathematical journal},
     pages = {233--242},
     year = {1995},
     volume = {37},
     number = {2},
     doi = {10.1017/S001708950003113X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950003113X/}
}