546,860 TRENDS Trends in the pharmacology of neurotransmission : dedicated to Professor Vesselin Petkov on his 70 birthday /Bulgarian Academy of Sciences, Institute of Physiology ; pod red. Stojceva C. [et al.]. - So- fia : Publ. House of the Bułgarian Academy od Scien- ces, 1987. - 341, [1] s., [1] s. portr.: il., wykr. ; 24 cm