Synthesis of (±)-(2-Methylenecyclopropyl)glycine and (±)-4-[(Amino(carboxymethyl)]spiro[2.2]pentane-1-carboxylic Acid - Averina, Elena B; Yashin, Nikolai V; Grishin, Yurii K; Kuznetsova, Tamara S; Zefirov, Nikolai S (Synthesis, 2006)