1. (1968). . , .:
  2. .. . (1991). , . ޣ , , , 128 .
  3. Floden Tom, Tunander Pal, Wickman Frans E. (1986). The Tvaeren Bay structure, an astrobleme in southeastern Sweden . Geol. foeren. Stockholm foerhandl., Vol.108, No.3, P. 225-234
  4. Lindstrom M., Puura V., Floden T., Bruun A. (1992). Ordovician impacts at sea in Baltoscandia . Pap. Present. Int. Conf. Large Meteorite Impacts and Planet. Evol., Sudbury, Aug. 31 - Sept. 2, 1992 , Houston (Tex.), P. 47
  5. Lindstrom Maurits, Floden Tom, Puura Vaino, Suuroja Kalle (1992). The Kardla, Tvaren, and Lockne craters - possible evidences of an Ordovician asteroid swarm . . . ., Vol.41, No.2, P. 45-53
  6. Grahn Yngve, Nolvak Jaak (1993). Chitinozoan dating of Ordovician impact events in Sweden and Estonia. A preliminary note. Geol. foren. Stockholm forhandl., Vol.115, No.3, P. 263-264
  7. Tornberg R. (1996). Impact-related resurge sedimentology as exemplified by the Lockne, Tvaren and Kardla structures. GFF, Vol.118, P. 103
  8. Pesonen L.J. (1996). The geophysical signatures of terrestrial impact craters. Role Impact Process. Geol. and Biol. Evol. Planet Earth: Int. Workshop, Postojna, Sept. 27 - Oct. 2, 1996: Abstr. Geol. West Sloven. Field Guide , Ljubljana, P. 61-62
  9. Wallin Asa, Hagenfeldt Stefan E. (1996). Biostratigraphical investigation of Middle Ordovician acritarchs in the post-impact sequence in the Tvaren-2, core, Sweden. GFF, Vol.118, No.2, P. 79-82
  10. Wallin A. (1999). Middle Ordovician Acritarchs from Impact Structures in Sweden. Ber. Polarforsch., No.343, P. 103-105
  11. Wallin Asa (1999). Middle ordovician acritarchs from impact structures in Sweden . Acta Univ.Carol.Geol [Pap. of the 8th Intern.Symp.on the Ordovic.Sys."Quo vadis Ordovician?', Prague, Vol.43, No.1, P. 269-270
  12. Jarmo Moilanen (2004). References.
  13. John G. Spray, Director PASSC (2005). Impact Structures listed by Name. Current total number of confirmed impact structures: 172.
  14. Frisk A.M., Lindstrom M., Holmer L.E. (2006). The aftermath of marine impacts: Faunal recovery and sedimentation in the Ordovician Tvaren crater, Sweden . Bull. Geol. Soc. Finl., P. 37
  15. Osinski Gordon R. (2006). The geological record of meteorite impacts. 40th ESLAB First International Conference on Impact Cratering in the Solar System, 8-12 May 2006., Noordwijk,The Netherlands
  16. ` `


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