@article{JTNB_2019__31_3_613_0,
     author = {Philippe Guillot and Luz E. Marchan and Oscar Ordaz and Wolfgang A. Schmid and Hanane Zerdoum},
     title = {On the {Harborth} constant of $C_3 \oplus C_{3p}$},
     journal = {Journal de th\'eorie des nombres de Bordeaux},
     pages = {613--633},
     publisher = {Soci\'et\'e Arithm\'etique de Bordeaux},
     volume = {31},
     number = {3},
     year = {2019},
     doi = {10.5802/jtnb.1097},
     mrnumber = {4102617},
     zbl = {07246530},
     language = {en},
     url = {https://jtnb.centre-mersenne.org/articles/10.5802/jtnb.1097/}
}