@article{ADM_2019_27_2_a4,
     author = {Vitalij M. Bondarenko and Marina V. Styopochkina},
     title = {The classification  of  serial  posets with the non-negative quadratic {Tits} form being principal},
     journal = {Algebra and discrete mathematics},
     pages = {202--211},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2019_27_2_a4/}
}