#### Volume 4, issue 2 (2004)

 1 M Ando, J Morava, A renormalized Riemann–Roch formula and the Thom isomorphism for the free loop space, from: "Topology, geometry, and algebra: interactions and new directions (Stanford, CA, 1999)", Contemp. Math. 279, Amer. Math. Soc. (2001) 11 MR1850739 2 G Z Arone, K Bauer, J D Christensen, D C Isaksen, A classification of polynomial functors using pro-spectra, in preparation 3 , Théorie des topos et cohomologie étale des schémas. Tome 2, Lecture Notes in Mathematics 270, Springer (1972) MR0354653 4 M Artin, B Mazur, Etale homotopy, Lecture Notes in Mathematics 100, Springer (1969) MR0245577 5 J C Becker, D H Gottlieb, A history of duality in algebraic topology, from: "History of topology", North-Holland (1999) 725 MR1721120 6 A K Bousfield, E M Friedlander, Homotopy theory of $\Gamma$–spaces, spectra, and bisimplicial sets, from: "Geometric applications of homotopy theory (Proc. Conf., Evanston, Ill., 1977), II", Lecture Notes in Math. 658, Springer (1978) 80 MR513569 7 R L Cohen, J D S Jones, G B Segal, Floer's infinite-dimensional Morse theory and homotopy theory, from: "The Floer memorial volume", Progr. Math. 133, Birkhäuser (1995) 297 MR1362832 8 D Dugger, D C Isaksen, Etale homotopy and sums-of-squares formulas, Math. Proc. Cambridge Philos. Soc. 145 (2008) 1 MR2431636 9 W G Dwyer, J Spaliński, Homotopy theories and model categories, from: "Handbook of algebraic topology", North-Holland (1995) 73 MR1361887 10 D A Edwards, H M Hastings, Cech and Steenrod homotopy theories with applications to geometric topology, Lecture Notes in Mathematics 542, Springer (1976) MR0428322 11 A D Elmendorf, I Kriz, M A Mandell, J P May, Rings, modules, and algebras in stable homotopy theory, Mathematical Surveys and Monographs 47, American Mathematical Society (1997) MR1417719 12 P S Hirschhorn, Model categories and their localizations, Mathematical Surveys and Monographs 99, American Mathematical Society (2003) MR1944041 13 M Hovey, Model categories, Mathematical Surveys and Monographs 63, American Mathematical Society (1999) MR1650134 14 M Hovey, B Shipley, J Smith, Symmetric spectra, J. Amer. Math. Soc. 13 (2000) 149 MR1695653 15 D E Hurtubise, The Floer homotopy type of height functions on complex Grassmann manifolds, Trans. Amer. Math. Soc. 349 (1997) 2493 MR1401774 16 D C Isaksen, A model structure on the category of pro-simplicial sets, Trans. Amer. Math. Soc. 353 (2001) 2805 MR1828474 17 D C Isaksen, Calculating limits and colimits in pro-categories, Fund. Math. 175 (2002) 175 MR1969635 18 D C Isaksen, Etale realization on the $\mathbb A^1$–homotopy theory of schemes, Adv. Math. 184 (2004) 37 MR2047848 19 D C Isaksen, Strict model structures for pro-categories, from: "Categorical decomposition techniques in algebraic topology (Isle of Skye, 2001)", Progr. Math. 215, Birkhäuser (2004) 179 MR2039766 20 D C Isaksen, Completions of pro-spaces, Math. Z. 250 (2005) 113 MR2136405 21 J P May, Stable algebraic topology, 1945–1966, from: "History of topology", North-Holland (1999) 665 MR1721119 22 C V Meyer, Approximation filtrante de diagrammes finis par Pro-$C$, Ann. Sci. Math. Québec 4 (1980) 35 MR574833 23 D G Quillen, Homotopical algebra, Lecture Notes in Mathematics 43, Springer (1967) MR0223432 24 E H Spanier, J H C Whitehead, Duality in homotopy theory, Mathematika 2 (1955) 56 MR0074823 25 D Sullivan, Genetics of homotopy theory and the Adams conjecture, Ann. of Math. $(2)$ 100 (1974) 1 MR0442930