1. NMR
Research Unit, University of Oulu, P.O. Box 3000, FI-90400 Oulu, Finland
2. Department
of Physics, The University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom
3. Institute
of Geology and Nature Management, Far Eastern Branch of the Russian Academy of Sciences, Ryolochny Lane 1, Blagoveshchensk 675000, Amur Region, Russia
4. Chemistry
of Interfaces, Luleå University of Technology, SE-971 87, Luleå, Sweden