Petrova, D. Structure and the development of the phytoplankton ( 2001 -2003 ) in the Bulgarian wetlands, north part of the Black Sea. 2006 с. 261-267,.
Petrova, D. Structure and the development of the phytoplankton ( 2001 -2003 ) in the Bulgarian wetlands, north part of the Black Sea. 2006 с. 261-267,.
Petrova, D. (2006) Structure and the development of the phytoplankton ( 2001 -2003 ) in the Bulgarian wetlands, north part of the Black Sea, с. 261-267,.
Petrova, D. (2006). Structure and the development of the phytoplankton ( 2001 -2003 ) in the Bulgarian wetlands, north part of the Black Sea. с. 261-267.
Petrova D. Structure and the development of the phytoplankton ( 2001 -2003 ) in the Bulgarian wetlands, north part of the Black Sea. 2006. p. с. 261-267.