Figure 4 from NUCLEAR THERMAL ROCKET/VEHICLE CHARACTERISTICS AND SENSITIVITY TRADES FOR NASA's MARS DESIGN REFERENCE ARCHITECTURE (DRA) 5.0 STUDY

NASA's Mars Design Reference Mission Goes Nuclear (2001)

Full article: Preliminary Conceptual Design of Nuclear Thermal Rocket Reactor Cores Using Ceramic Fuels with Beryllium or Composite Neutron Moderators

Design of a passive safety system for a nuclear thermal rocket - ScienceDirect

NTP – Beyond NERVA

Realistic Designs A-G - Atomic Rockets

Design of a passive safety system for a nuclear thermal rocket - ScienceDirect

Mars DRA 5.0 mission profile using nuclear thermal in-space propulsion

NTP – Beyond NERVA

Innovative concept for an ultra-small nuclear thermal rocket utilizing a new moderated reactor - ScienceDirect

PDF] Modular Growth NTR Space Transportation System for Future NASA Human Lunar, NEA and Mars Exploration Missions

Full article: Preliminary Conceptual Design of Nuclear Thermal Rocket Reactor Cores Using Ceramic Fuels with Beryllium or Composite Neutron Moderators

PDF) Research Progress Toward Engineering Feasibility of the Centrifugal Nuclear Thermal Rocket