1. Comparison of different ionospheric foF2 parameter single station models in European area;Alberca,1997
2. PRIME (Prediction and Retrospective Ionospheric Modelling over Europe);Bradley,1995
3. ITU-R Reference Ionospheric Characteristics,1997
4. Model of the Mid-latitude Ionospheric Trough on the Base of COSMOS-900 and INTERCOSMOS-19 Satellites Data;Karpachev;Adv. Space Res.,1997
5. A method for foF2 and M(3000)F2 Instantaneous Mapping over Europe (MQMF2-INST Model);Mikhailov,1995