Ознакомиться с содержанием статей можно по следующим ссылкам:
1) Elliptic Orbit Constellations for Regional Communication and Molniya-Zond Satellite Constellation (researchgate.net)
https://www.researchgate.net/publication/252338526_Elliptic_Orbit_Constellations_for_Regional_Communication_and_Molniya-Zond_Satellite_Constellation
2) Satellite networks using mid-altitude elliptical orbit constellation «MOLNIYA-ZOND» (researchgate.net)
https://www.researchgate.net/publication/293088290_Satellite_networks_using_mid-altitude_elliptical_orbit_constellation_MOLNIYA-ZOND