@article{RCM_1980__14_181695,
     author = {Osvaldo Marrero},
     title = {A {Conjecture} {Concerning} {The} {Existence} {Of} {Certain} {Combinatorial} {Designs.}},
     journal = {Revista colombiana de matematicas},
     pages = {95--100},
     publisher = {mathdoc},
     volume = {14},
     year = {1980},
     zbl = {0463.05018},
     url = {http://geodesic.mathdoc.fr/item/RCM_1980__14_181695/}
}