1. Method and apparatus for obtaining fibrous materials by application of ‘High Temperature Shock’;Khristov;Cellulose Chem. Technol.,1980
2. Chemical composition of papyrus stems and development of a new method for pulping;Khristova;PhD Thesis,1974
3. Khristova, P., Khristov, Tzv. & Petrov, S. (1973). Bulgarian Patent No. 24228/73.
4. High-yield pulps from Eucalyptus camaldulensis and Oxytenanthera abyssinica;Khristova;Sudan Silva,1981
5. Practical works of cellulose and wood chemistry;Obolenskia,1965