Growth tightness of free and amalgamated products
Annales scientifiques de l'École Normale Supérieure, Serie 4, Volume 35 (2002) no. 4, p. 477-488 
@article{ASENS_2002_4_35_4_477_0,
     author = {Sambusetti, Andrea},
     title = {Growth tightness of free and amalgamated products},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     publisher = {Elsevier},
     volume = {Ser. 4, 35},
     number = {4},
     year = {2002},
     pages = {477-488},
     doi = {10.1016/s0012-9593(02)01101-1},
     zbl = {1018.20036},
     mrnumber = {1981169},
     language = {en},
     url = {http://www.numdam.org/item/ASENS_2002_4_35_4_477_0}
}

Sambusetti, Andrea. Growth tightness of free and amalgamated products. Annales scientifiques de l'École Normale Supérieure, Serie 4, Volume 35 (2002) no. 4, pp. 477-488. doi : 10.1016/s0012-9593(02)01101-1. http://www.numdam.org/item/ASENS_2002_4_35_4_477_0/

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