no. 1

Quelques remarques sur les diagrammes de Heegard
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 24 (1970) no. 1, pp. 37-52. 
@article{ASNSP_1970_3_24_1_37_0,
     author = {Po\'enaru, Valentin},
     title = {Quelques remarques sur les diagrammes de Heegard},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {37--52},
     publisher = {Scuola normale superiore},
     volume = {3e s{\'e}rie, 24},
     number = {1},
     year = {1970},
     zbl = {0218.55004},
     mrnumber = {270376},
     language = {fr},
     url = {http://www.numdam.org/item/ASNSP_1970_3_24_1_37_0/}
}
Poénaru, Valentin. Quelques remarques sur les diagrammes de Heegard. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 24 (1970) no. 1, pp. 37-52. http://www.numdam.org/item/ASNSP_1970_3_24_1_37_0/

[1] A.G. Kurosh: The theory of groups. Chelsea 1956. | MR 109842 | Zbl 0064.25104

[2] C.D. Papakyriakopoulos: On solid tori. Proc. London Math. Sc. 7 (1957) pp. 281-299. | MR 87944 | Zbl 0078.16305

[3] C.D. Papakyriakopoulos: On Dehn's lemma and the asphericity of knots. Ann. of Math. 66 (1957) pp. 1-26. | MR 90053 | Zbl 0078.16402

[4] V. Poénaru: Constructions on low-dimensional differentiable manifolds. B. A. M. S. 74 (1968) pp. 253-257. | MR 226663 | Zbl 0159.54001

[5] V. Poénaru: Sur les variétés différentiables de basses dimension. Symposia Matematica vol. II, 1968 pp. 363-369 (Istituto Nazionale di Alta Matematica). | Zbl 0187.45204

[6] J. Stallings: How not to prove the Poincaré conjecture. (Topology Seminar Ann. of Math. Studies 60 (1966)). | Zbl 0152.22604