@article{10_4064_am_19_3_4_635_641,
     author = {M. Chrobak and M. Habib and P. John and H. Sachs and H. Zernitz and J. R. Reay and G. Sierksma and M. M. Sys{\l}o and T. Traczyk and W. Wessel},
     title = {PROBLEMS},
     journal = {Applicationes Mathematicae},
     pages = {635--641},
     publisher = {mathdoc},
     volume = {19},
     number = {3-4},
     year = {1987},
     doi = {10.4064/am-19-3-4-635-641},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-19-3-4-635-641/}
}