M\'ethodes aux grandes \'echelles pour mesurer la topologie (globale) de   l'Univers
  Several recent large length scale methods of detecting the topology of the Universe are briefly reviewed. Three-dimensional methods include those of Lehoucq, Luminet & Lachi\`eze-Rey (1996), Roukema (1996) and Roukema & Edge (1997). The two-dimensional ``circles'' method of Cornish, Spergel & Starkman (1996b) is also mentioned. 
Boudewijn F. Roukema (Obs. Strasbourg)