@article{10_4064_sm221_1_5,
     author = {Andreas Defant and Mieczys{\l}aw Masty{\l}o},
     title = {Factorization and extension of positive
 homogeneous polynomials},
     journal = {Studia Mathematica},
     pages = {87--99},
     year = {2014},
     volume = {221},
     number = {1},
     doi = {10.4064/sm221-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm221-1-5/}
}