The paper “Valiente Kroon’s obstructions to smoothness at infinity” co-authored by James Grant and Paul Tod (Oxford) has been published in the journal General Relativity and Gravitation. A link to the published paper is here. In the paper they conjecture an interpretation in terms of multipole moments of the obstructions to smoothness at infinity found for time-symmetric, conformally-flat initial data by Kroon (Comm. Math. Phys. 244: 133-156, 2004).