1. Gaugusch Z., Kafel St.: Studies on Growth Increasing Factor on Artificial Media Using the Keratin Hydrolizate. Bull. Inst. Vet. Puławy 2/1957.
2. Gaugusch Z., Niemczycka - Węgrzyn S.: Studies on Harmlesssess of Orally Administered Hydrolizate of Keratin for Animals. Bul. Ins. Vet. Puławy, 3, 4/1957.
3. Gaugusch Z., Niemczycka - Węgrzym S., Wideńsika T.: Studies on Harmmlessness of Orally Administered Hydrolizate of Keratin for Animals Med. Vet. 9/1957.
4. Siebierzanka K., Wójcik K: Attempts to Use Keratin Hydrolizate for Feeding of Animals. Ann. of Higher Agric. School, Cracow, Zootechnics, 1, 3/1957.
5. Wójcik M.: Preliminary Experiments on the Nutritive Value of Horn-Meal and Keratin Hydrolizate. Med. Vet. 10/1958.
6. Juszkiewicz T., Niemczycka-Węgrzyn St.: Effect of Keratin Hydrolizate on Healing of Experimental Wounds Med. Vet. 10/1958.