@inbook{ HRISTOVA_BOJKOV:773-779,

author = { MARIA HRISTOVA VASSILEVA and NIKOLAY BOJKOV VASSILEV } ,

title = { SOLUBILIZATION OF NATURAL HYDROXYAPATITE BY LACTIC ACID PRODUCING RHIZOPUS ARRHIZUS IMMOBILIZED IN POLYURETHANE FOAM },

booktitle = { GEO-SCIENCE AND ENVIRONMENT },

publisher = { GEOSCIENCE SGEM LTD },

pages = { 773 - 779 },

year = { 2010 },

}