@article{10_4153_CJM_1981_109_x,
     author = {Yoshizawa, Mitsuo},
     title = {On {Block-Schematic} {Steiner} {Systems:} {S(t,} t + 1, v)},
     journal = {Canadian journal of mathematics},
     pages = {1432--1438},
     year = {1981},
     volume = {33},
     number = {6},
     doi = {10.4153/CJM-1981-109-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-109-x/}
}