Selection Rules for Topology Change
Les rencontres physiciens-mathématiciens de Strasbourg -RCP25, Tome 43 (1992), Exposé no. 11, 4 p. 
@article{RCP25_1992__43__199_0,
     author = {Gibbons, G. W.},
     title = {Selection {Rules} for {Topology} {Change}},
     journal = {Les rencontres physiciens-math\'ematiciens de Strasbourg -RCP25},
     note = {talk:11},
     pages = {199--202},
     publisher = {Institut de Recherche Math\'ematique Avanc\'ee - Universit\'e Louis Pasteur},
     volume = {43},
     year = {1992},
     language = {en},
     url = {http://archive.numdam.org/item/RCP25_1992__43__199_0/}
}
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PB  - Institut de Recherche Mathématique Avancée - Université Louis Pasteur
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Gibbons, G. W. Selection Rules for Topology Change. Les rencontres physiciens-mathématiciens de Strasbourg -RCP25, Tome 43 (1992), Exposé no. 11, 4 p. http://archive.numdam.org/item/RCP25_1992__43__199_0/

(1) G. W. Gibbons and S. W. Hawking: Selections Rules for Topology Change, DAMTP Preprint to appear in Comm. Math. Phys. | MR | Zbl

(2) G. W. Gibbons and S. W. Hawking: Kinks and Topology Change, DAMTP Preprint | MR | Zbl